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Did the Mongol Empire Deliver Gunpowder to Europe? - The Siege Camps of the Mongol Empire | Sleepy Facts About History · Sleepy Facts About History

0:04
Welcome to Sleepy Facts About History. When we
0:13
picture a Mongol army, most of us imagine horsemen
0:16
sweeping across open steppe. But by the time
0:20
Mongol forces reached the walled cities of Northern
0:22
China, Central Asia and the Middle East, they
0:26
had transformed into something entirely different.
0:29
Mobile siege operations assembled from conscripted
0:32
engineers across a continent. This episode explores
0:36
how that transformation happened, and what it
0:38
meant for the movement of explosive and incendiary
0:41
technologies across Eurasia. Rather than a simple
0:45
story of invention or a clean east -to -west
0:48
delivery, the Mongol conquests created a vast,
0:51
coerced, and unprecedentedly connected space
0:54
for technological exchange. Chinese carpenters.
0:59
Persian counterweight specialists. and Arab incendiary
1:03
experts were captured and redeployed thousands
1:06
of miles from their homes. Together, they operated
1:10
machinery none of them had originally invented,
1:13
combining distinct engineering traditions to
1:16
batter down formidable fortifications from the
1:19
Yellow River to the Tigris. I wanted to understand
1:23
why gunpowder and siege weapons appeared in the
1:26
Middle East and Europe so soon after the Mongol
1:29
unification of Eurasia. As I worked through this
1:33
question, I kept returning to the limits of historical
1:36
evidence. Medieval chronicles vividly describe
1:40
exploding projectiles and crumbling walls, but
1:43
they rarely specify the chemical mechanisms behind
1:46
them. By examining the sieges of Uttara, Shanyang
1:51
and Baghdad, we can see how the Mongol corridor
1:54
accelerated technological contact, even when
1:58
the exact pathways of transmission remain invisible.
2:04
The Mongol army that reached the walls of Baghdad
2:07
in 1258 was not the same force that had left
2:11
the steppe two generations earlier. It was a
2:14
mobile siege operation, assembled from Chinese
2:17
engineers, Persian counterweight specialists,
2:20
and Arab incendiary experts. These specialists
2:25
operated machinery none of them had invented,
2:29
and all of them had been compelled to serve.
2:32
How that transformation occurred, and what it
2:35
meant for the movement of explosive knowledge
2:37
across Eurasia, is a story not of simple delivery,
2:41
but of a corridor. It was a vast, coerced, unprecedentedly
2:47
connected space through which technologies travelled
2:50
faster than before, without ever producing one
2:53
clean east -to -west transfer. When we picture
2:57
a Mongol army, most of us imagine something specific.
3:02
We imagine thousands of horsemen sweeping across
3:05
open steppe, bows drawn, moving too fast for
3:09
any infantry force to catch. That image is not
3:13
wrong, but it is incomplete. By the time Mongol
3:17
armies reached the great walled cities of northern
3:20
China, Central Asia and the Middle East, they
3:24
had become something else entirely. They had
3:27
become mobile siege operations that assembled
3:30
engineers from across a continent, moved them
3:33
thousands of miles and directed bombardments
3:36
that could reduce fortified walls to rubble.
3:39
The question this episode pursues is how that
3:42
transformation happened and what it meant for
3:45
the movement of explosive and incendiary technologies
3:48
across Eurasia. The answer is not a simple story
3:53
of invention or delivery. It is the story of
3:56
a corridor. It was a vast, often coerced, unprecedentedly
4:01
connected space through which specialists and
4:04
their knowledge travelled faster and farther
4:06
than before. This accelerated contact without
4:09
producing one clean east -to -west transfer.
4:13
To understand how this corridor formed, we need
4:16
to begin with what the Mongols initially lacked.
4:19
In the late 12th and early 13th centuries, the
4:23
armies united under Temüjin, later Genghis Khan,
4:27
were superb cavalry forces. Their strength lay
4:31
in mobility, coordination, and the composite
4:34
bow. But siege warfare, the systematic reduction
4:38
of fortified cities, was not their inheritance.
4:41
A steppe had not required it. When the Mongols
4:46
first encountered the walled cities of the Jin
4:48
Dynasty in northern China, beginning in 1211,
4:52
they faced a military problem. Their traditional
4:55
tactics could not solve directly. The Djinn had
4:59
spent centuries defending against steppe incursions.
5:03
Their cities had thick walls, deep moats and
5:06
stored provisions. Cavalry could ravage the countryside
5:11
and isolate a city, but the walls remained. The
5:16
Mongol response set a pattern that would repeat
5:18
across their conquests. They did not develop
5:22
siege expertise from within their own population.
5:25
They captured it. Jin Dynasty engineers, craftsmen
5:29
and soldiers with technical knowledge were incorporated
5:32
into Mongol forces. This happened sometimes willingly
5:36
and more often under duress. These were not minor
5:40
additions. Chinese military tradition had developed
5:44
sophisticated siege technology over centuries.
5:47
This technology was documented in texts like
5:51
the Wujing Zongyao. a song dynasty military encyclopedia
5:55
compiled around 1044 two centuries before the
5:59
mongol rise that text contains the earliest surviving
6:03
gunpowder formulas and descriptions of incendiary
6:07
and explosive weapons these included fire lances
6:11
bombs thrown by trebuchet and chemical mixtures
6:15
designed to burn poison or produce smoke the
6:19
mongols did not invent this technology They acquired
6:23
it by conquest and redeployed it. This pattern
6:27
of capture and incorporation became systematic.
6:31
By the time of the major Central Asian campaigns,
6:35
Mongol armies traveling westward carried Chinese
6:38
engineers and their equipment with them. The
6:42
Siege of Uttara in 1219 -1220 illustrates the
6:46
method. Uttara was a Khwarazmian city on the
6:50
Cedar -d 'Uri River. Its governor had killed
6:54
Mongol merchants and envoys, provoking Genghis
6:57
Khan's full -scale invasion. The city had substantial
7:01
walls and a determined garrison. Mongol forces
7:04
surrounded it and settled in for months of methodical
7:08
reduction. Contemporary accounts, including those
7:12
of the Persian historian Atta Malik Juveni, writing
7:15
in the 1260s, describe the use of siege engines,
7:20
mining operations. and the mobilization of local
7:24
labor under Mongol direction. The defenders held
7:28
out for approximately five months before the
7:31
city fell. What matters for our purposes is not
7:34
the duration but the composition of the besieging
7:37
force. It included Mongol cavalry, yes, but also
7:42
engineers operating machinery that required technical
7:45
knowledge the original Mongol army had not possessed.
7:49
The fall of Otrar opened the Khwarazmian campaign
7:52
and with it the corridor began to function in
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both directions. The Mongols took Bukhara, Samarkand
8:00
and eventually Gurganj. Each siege demonstrated
8:04
the same pattern of incorporating local specialists.
8:08
But something else happened too. As Mongol forces
8:12
moved westward, they encountered Islamic military
8:15
engineering traditions that had developed along
8:17
different lines. The traction trebuchet, man
8:21
-powered, with crews pulling ropes to swing a
8:24
lever arm, was known in both Chinese and Islamic
8:28
warfare. But the counterweight trebuchet, which
8:32
used a heavy falling weight rather than human
8:34
muscle, had developed in the Middle East and
8:37
Mediterranean world by the 12th and 13th centuries.
8:40
It could throw heavier projectiles with greater
8:43
consistency. As Mongol armies absorbed Persian
8:47
and Central Asian engineers, they acquired this
8:51
technology too. The corridor was not a one -way
8:55
street from east to west. It was a network in
8:58
which techniques moved in multiple directions,
9:01
recombined and were redeployed. This two -way
9:05
movement becomes most visible in the siege of
9:08
Xiangyang. a Song Dynasty fortress city besieged
9:11
by Mongol forces from 1267 to 1273. The Song
9:17
had held Xiangyang and its sister city Fancheng
9:20
for years, protected by river barriers and determined
9:23
resistance. According to Persian and Chinese
9:27
sources, the Mongol commander Aju requested engineers
9:31
from the Ilkhanate in the Middle East to assist
9:34
with the siege. The response included Persian
9:37
engineers who introduced or improved counterweight
9:41
trebuchets capable of throwing massive stones
9:43
that Song defences could not withstand. The city
9:48
fell in 1273. Whether these were precisely the
9:53
same engines as those developed in Syria, or
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whether they represented adapted designs remains
9:58
debated among specialists. What is clear is that
10:02
knowledge and personnel had moved from the Middle
10:05
East back to China in Mongol service. This movement
10:09
was deliberate, organized and militarily decisive.
10:12
By this point, the Mongol military had become
10:16
what we might call, with appropriate caution,
10:19
a mobile military -industrial complex. We should
10:24
not project modern institutional structures onto
10:27
medieval practice. The siege camp was a multilingual
10:32
multi -ethnic technical operation and we can
10:35
picture its layout with reasonable confidence
10:37
timber frameworks rose in sections near the perimeter
10:42
where chinese carpenters assembled and repaired
10:46
the machines rope crews gathered at the traction
10:49
trebuchets dozens of men per engine arranging
10:53
themselves to pull in unison when the command
10:56
came the operation was rhythmic the crew hauled
11:01
The lever arm swung upward, the sling released,
11:04
and the projectile arced toward the walls. Then
11:08
came the pause while the engine was reset and
11:11
the crew regrouped. Nearby, the counterweight
11:15
trebuchets moved on a different rhythm. Their
11:19
heavy boxes of earth or stone had to be raised
11:22
by windlass or by teams of laborers. This was
11:27
a slower preparation that produced a heavier
11:29
throw. The thud of the counterweight dropping,
11:33
the deeper sound of the arm's release, and the
11:36
longer flight of a larger projectile would have
11:39
distinguished these engines from their lighter
11:41
counterparts. In another section of the camp,
11:45
specialists prepared incendiary projectiles.
11:49
Naft, the petroleum -based mixture that burned
11:52
even on water, was loaded into ceramic containers
11:55
that would shatter on impact and spread flame
11:58
across walls and rooftops. Mongol overseers moved
12:02
between these stations, coordinating a technical
12:06
operation that required translation across multiple
12:09
languages and traditions. The smells would have
12:12
layered over each other. There was the pitch
12:15
and resin of timber frameworks, the sulfur and
12:19
saltpeter of incendiary mixtures, the acrid smoke
12:22
of burning naphtha and the dust raised by impact.
12:26
These were not the sounds and smells of steppe
12:29
cavalry. They were the sounds and smells of a
12:32
transformed army. The Middle Eastern campaigns
12:36
under Hulagu Khan, grandson of Genghis, brought
12:40
this siege capability to its most dramatic test.
12:44
In 1258, Hulagu's forces besieged Baghdad, the
12:49
capital of the Abbasid Caliphate and one of the
12:52
great cities of the Islamic world. The Caliph's
12:55
army was outmaneuvered and outnumbered. The city
12:59
walls formidable as they were. faced a bombardment
13:02
that contemporary sources describe in terrifying
13:04
terms. Juvaini, who served the Mongol administration
13:09
and wrote his History of the World Conqueror
13:12
shortly after these events, describes trebuchets
13:16
operating in batteries. Multiple engines were
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positioned to concentrate their fire on specific
13:22
sections of wall. Incendiary projectiles set
13:27
fires within the city. Defenders watched masonry
13:31
crumble under sustained impact. The caliph was
13:35
executed. The libraries were destroyed, though
13:39
later legend claims this was accomplished by
13:41
deliberate flooding. That detail is not supported
13:45
by Yuvaini's account or other contemporary sources.
13:49
Baghdad's political significance as an independent
13:52
caliphate ended. But what exactly were the weapons
13:56
used at Baghdad? Giovanni describes projectiles
14:00
that burst into flame, walls damaged by bombardment,
14:03
and fires spreading through districts. These
14:07
descriptions are vivid but technically imprecise.
14:10
A projectile that exploded or burst into flame
14:14
in a medieval chronicle could indicate a gunpowder
14:17
device, a petroleum -based incendiary, or even
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a mechanical effect. A stone impact could produce
14:25
flame from stored combustibles within the city.
14:29
The Persian term Manjinic and the Chinese term
14:32
Wao Pao, often translated as fire catapult or
14:37
fire bomb, do not map cleanly onto modern technical
14:41
categories. Wao Pao, in Song and Yuan sources,
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could refer to incendiary projectiles thrown
14:49
by trebuchet, to explosive devices using gunpowder.
14:54
or to various combinations of these the same
14:57
term might describe different devices in different
15:00
contexts naft was definitely not gunpowder it
15:05
was petroleum -based a technology with ancient
15:08
roots in the middle east when chronicles describe
15:12
dramatic explosions walls crumbling and fire
15:15
spreading we cannot automatically identify a
15:18
gunpowder mechanism mechanical destruction Incendiary
15:23
projectiles and explosive gunpowder devices could
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all produce similar effects in description. The
15:29
sources tell us that Baghdad suffered a devastating
15:32
siege. They do not allow us to specify the chemical
15:36
composition of every weapon employed. This translation
15:40
problem is not a minor scholarly quibble. It
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goes to the heart of what we can and cannot claim
15:47
about technology transfer. If we cannot identify
15:50
gunpowder weapons with certainty at Baghdad,
15:53
we cannot claim that Mongol forces delivered
15:56
gunpowder artillery to the Middle East in 1258.
16:00
What we can say is that Mongol siege operations
16:03
combined Chinese and Islamic engineering traditions
16:06
in unprecedented ways. Incendiary and explosive
16:11
weapons of various kinds were employed. The specialists
16:15
who operated them moved across enormous distances
16:18
in Mongol service. The corridor functioned. Its
16:23
exact technical contents at any given moment
16:26
are harder to establish. The question of what
16:29
actually moved westward, and when, brings us
16:33
to the most contested terrain in this subject.
16:36
Gunpowder weapons did appear in Europe in the
16:38
early 14th century. The 1326 Manuscript by Walter
16:43
de Melamate. depicts a vase -shaped cannon, one
16:47
of the earliest European representations. By
16:50
1331, gunpowder weapons were used at the siege
16:54
of Kivadal in Italy. These appearances follow
16:58
the Mongol period, but are not cleanly connected
17:01
to it. The Mongol corridor was one possible route.
17:06
Chinese gunpowder technology, developed over
17:09
centuries before the Mongol rise, could have
17:11
travelled westward through the movement of engineers.
17:14
through captives taken in siege and redeployed,
17:17
or through merchants traveling the Silk Road
17:20
networks, that the Mongol -Yam postal system
17:24
made safer and more regular than before. But
17:27
it was not the only route. Merchants, particularly
17:31
those involved in the luxury trade between China
17:34
and the Middle East, carried goods, information,
17:38
and possibly manuscripts. The Islamic world itself
17:41
was not merely a passive recipient. Scholars
17:45
in Mamluk Egypt, Ilkhanate Persia, and elsewhere
17:49
engaged with alchemical and military knowledge
17:52
in ways that may have produced independent developments
17:55
or parallel experiments. The problem is not absence
17:59
of possible roots. The problem is abundance.
18:04
There are too many possible roots and too few
18:07
definite links. The Heilongjiang Hand Cannon,
18:11
excavated in Manchuria. and dated to the late
18:14
13th century provides material evidence for early
18:18
metal barrel gunpowder weapons in china it is
18:21
a bronze tube about the length of a man's forearm
18:24
heavy enough to require two hands or a mounting
18:27
it could be held or mounted and fired with gunpowder
18:31
its existence confirms that canon technology
18:35
existed in china before european appearance But
18:39
the excavation does not establish the route by
18:41
which knowledge of such devices reached Europe,
18:44
or whether it did so directly. The gap between
18:48
Chinese evidence and European appearance is not
18:51
empty. It is crowded with possibilities that
18:54
the surviving sources do not allow us to sort
18:57
definitively. Some scholars have emphasized the
19:01
role of the Islamic world as an intermediary
19:03
and innovator. They argue that gunpowder knowledge
19:07
developed in Muslim contexts through alchemical
19:10
experimentation and military adaptation, not
19:14
merely as transmission from China. Others have
19:17
stressed European local development. They suggest
19:21
that alchemical traditions in the Latin West
19:23
could have produced gunpowder independently once
19:26
the basic ingredients, saltpeter, sulfur, and
19:30
charcoal, were recognized and combined. The current
19:35
scholarly consensus, such as it is, favors some
19:38
form of transmission from China westward, but
19:41
through multiple routes and with significant
19:43
local adaptation, rather than a single Mongol
19:47
delivery. The Mongol corridor accelerated this
19:50
process. It did not constitute it. The claim
19:55
sometimes made that the Mamluks used hand cannon
19:57
against the Mongols at Ain Jalut in 1260 illustrates
20:01
how easily speculation outruns evidence. Ain
20:05
Jalut was indeed a major Mongol defeat, a turning
20:09
point in Middle Eastern history that established
20:12
Mamluk resistance to Ilkhanid expansion. But
20:16
contemporary sources for the battle do not describe
20:18
gunpowder weapons. The claim appears in later
20:22
accounts and has been repeated in some popular
20:24
histories, but it cannot be supported from the
20:27
evidence available. This is not to say that gunpowder
20:31
weapons were absent from the Mamluk -Ilkhanate
20:34
conflicts that followed, only that we must be
20:37
precise about what particular sources can and
20:40
cannot show. We must resist the temptation to
20:44
fill gaps in our knowledge with dramatic but
20:46
unsupported assertions. What emerges from this
20:50
examination is a model more complex and more
20:53
interesting than simple transfer. The Mongol
20:56
Empire created a connected political space across
20:59
Eurasia unprecedented in scale. Within that space,
21:03
people moved. Engineers were conscripted from
21:07
Jin and Song China. Persian and Arab specialists
21:10
were incorporated to incarnate forces. Central
21:14
Asian craftsmen were transported between campaigns.
21:18
Knowledge moved with them. This included the
21:22
construction and operation of traction and counterweight
21:25
trebuchets, the preparation of incendiary mixtures,
21:29
and possibly the formulation and use of gunpowder.
21:33
Manuscripts moved too, though their survival
21:36
is fragmentary. The Wuzheng Zongyao itself was
21:40
compiled before the Mongol rise, but military
21:43
knowledge circulated in various forms. Mongol
21:47
era historians like Rashid al -Din writing his
21:51
Jami al -Tawarik around 1300, had access to informants
21:56
and sources across the empire. But this movement
22:00
was not smooth, frictionless or universal. It
22:03
was shaped by specific campaigns, by the decisions
22:07
of individual commanders, by the availability
22:10
of local specialists, and by the destruction
22:13
of libraries and craftsmen in the very sieges
22:17
that created the corridor. The Mongol system
22:20
of conscripting technical expertise was effective,
22:23
but ad hoc. It depended on the capture of living
22:26
knowledge in specific places and moments. The
22:30
five -month siege of Uttara, for instance, allowed
22:33
time for the organized extraction of specialist
22:36
labor. Other cities fell too quickly, or their
22:40
technical communities were destroyed before they
22:42
could be conscripted. When those specialists
22:45
died, when campaigns moved too quickly, When
22:49
local resistance prevented the organized extraction
22:51
of expertise, the corridor narrowed. It was always
22:56
a contingent achievement, not an automatic feature
22:58
of empire. The acceleration that Mongol conquests
23:03
provided is nonetheless real and historically
23:05
significant. Before the Mongol rise, knowledge
23:10
of Chinese gunpowder technology had traveled
23:12
slowly westward, if at all. The Song Dynasty
23:16
had developed it for centuries without clear
23:19
transmission to the Islamic world or Europe.
23:22
After the Mongol unification of Eurasia, gunpowder
23:26
weapons appeared in the Middle East and Europe
23:29
within a few generations. The correlation is
23:33
suggestive, and most scholars accept some causal
23:35
connection. But correlation is not clean causation.
23:40
The specific mechanisms which individuals, which
23:43
manuscripts, which captured craftsmen, which
23:46
merchant caravans remain largely invisible in
23:50
the surviving evidence we see the corridor's
23:53
effects more clearly than its internal workings
23:55
this uncertainty is not a failure of historical
23:59
method it is an honest recognition of what 13th
24:03
and 14th century sources can and cannot tell
24:06
us chronicles describe sieges in vivid but technically
24:11
imprecise terms Archaeological evidence like
24:14
the Heilongjiang Canon confirms specific capabilities,
24:18
but not their geographic spread. The absence
24:21
of a detailed technical manual tracing gunpowder's
24:25
route from China to Europe is not surprising.
24:28
Such documents rarely survive from any medieval
24:31
context. What we have is sufficient to establish
24:35
that Mongol warfare created unprecedented conditions
24:38
for technological contact. It is insufficient
24:42
to reduce that contact to a single traceable
24:45
pathway. The siege camps themselves, those multilingual,
24:50
multi -ethnic technical operations, assembled
24:54
before walled cities from the Yellow River to
24:56
the Tigris, reveal something important about
24:59
how technologies actually move in history. The
25:03
model of simple transfer, invention in one place
25:07
and diffusion to others. rarely captures the
25:10
complexity of real processes. The Mongol corridor
25:14
was a network of conquest, coercion, adaptation
25:17
and local experimentation. Chinese engineers
25:22
served Mongol commanders in Central Asia. Persian
25:25
engineers served Mongol commanders in China.
25:29
Arab specialists and incendiaries worked alongside
25:32
Chinese carpenters in siege camps from the Oxus
25:36
to the Yellow River. The technologies they deployed
25:39
were not identical to those their ancestors had
25:42
used. They were recombined, adapted, sometimes
25:46
misunderstood, sometimes improved. When gunpowder
25:51
weapons eventually appeared in Europe, they were
25:53
not Chinese devices dropped intact on a foreign
25:56
shore. They were the product of a long, complex,
26:00
partially visible process of contact and adaptation
26:04
across the Mongol corridor and beyond. To return
26:08
to the image with which we began, the Mongol
26:11
army before a walled city. We can now see that
26:15
image more precisely. The horsemen are still
26:18
there, but they are not the whole force. Behind
26:22
them, timber frameworks rise, assembled by Chinese
26:26
carpenters. Counterweights are loaded by Persian
26:30
engineers. Incendiary projectiles are prepared
26:34
by specialists whose training came from different
26:37
traditions. The commanders giving orders speak
26:40
Mongolian, but the technical instructions pass
26:43
through multiple languages. The city under bombardment
26:47
experiences destruction that no single tradition
26:50
could have produced. This is the corridor in
26:53
operation. It is not a delivery system, but a
26:56
contact zone. It is not a simple transfer. but
27:01
an acceleration of encounter across a space that
27:04
Mongol conquests had made for a time into a single
27:08
field of military operation. What the listener
27:12
should carry away is a corrected mental model.
27:15
The Mongols did not invent gunpowder, nor did
27:18
they single -handedly deliver firearms to the
27:21
West. They did something in some ways more remarkable.
27:25
They created conditions under which the accumulated
27:28
technical knowledge of China, Central Asia and
27:32
the Middle East could be mobilized, combined
27:34
and redeployed across distances previously unimaginable.
27:39
The explosive and incendiary technologies that
27:42
moved through this corridor were transformed
27:45
by that movement, not merely transported. Their
27:48
eventual appearance in Europe was one outcome
27:51
of a diffuse, multi -causal process in which
27:54
Mongol warfare was a major, but not exclusive
27:57
factor. The story is not less interesting for
28:01
being complex. It is more interesting because
28:04
it reveals how human societies actually encounter,
28:07
adapt, and transform the technologies they inherit
28:10
from others. This happens across languages, across
28:15
empires, across the walls of besieged cities,
28:18
in the multilingual camps of armies that did
28:21
not invent what they deployed but made possible
28:24
its unprecedented movement.