Long ago, a group called the Mongols lived on the plains. 

Long ago, the Mongols built a very big land. 
The Mongol army was very large and strong. 
Most soldiers were riders on horses. Each soldier had three or four horses. They would switch horses when one got tired. This let them travel fast for many days. They even put armor on their horses. 
Mongol soldiers were also great with bows. They used composite bows made of horn and wood. These bows were strong but small. This made them easy to use on a horse.
To send news, they used a fast mail system. It used horse stations to move messages quickly. They also used flags and horns to talk during battles.
The Mongol Empire was one of the largest groups of people to ever rule. 

Speed was a very important part of how the Mongol army worked. Most soldiers were riders on horses, which we call cavalry. Each soldier usually kept three or four horses with them. When one horse became tired, the rider would switch to a fresh one. This allowed them to travel at high speeds for many days without stopping. They even protected their horses with special armor made of small scales. This armor could cover the horse's body and even its forehead. 
Mongol soldiers were also famous for being very skilled with bows. They used a special type of bow called a composite bow. These bows were made by layering horn, wood, and sinew together. This design made the bow powerful but small enough to use on horseback.
To take over cities, the Mongols used many different tools and methods. They used siege machines and large crossbows to break through defenses. 
Even though they were a military power, they also focused on communication. The Mongols created a fast mail system called the örtöö. 
The military of the Mongol Empire was a highly organized force. 

Mobility was the foundation of Mongol warfare. Most soldiers were part of the cavalry, which means they fought on horseback. Each soldier typically maintained three or four horses at once. This allowed for incredible speed during long journeys. When a horse grew tired, the rider would simply switch to a fresh one. This rotation kept the army moving for many days without stopping. To preserve their mobility, they even protected their horses with lamellar armor. This armor consisted of small scales of iron, leather, or chain mail. It could cover the horse's body and even its forehead. 
The Mongols were also famous for their mastery of the composite bow. This was a specialized weapon made from layered materials. It used horn on the inner face to resist compression. It used sinew on the outer face to resist tension. These layers were bonded to a wood core. This construction made the bow powerful yet compact. A small size was necessary for use on a moving horse. Soldiers often carried two or three different bows. They might use a heavy bow for ground combat and a lighter one for riding.
Archery was used with mathematical precision in battle. A soldier could shoot an arrow over 300 meters away. They could also perform ballistic shots to hit groups at distances up to 400 meters. These long-range shots helped scare enemy troops before a direct attack. For better accuracy, riders would release arrows during the gallop. They aimed to fire when all four of the horse's feet were off the ground. Soldiers carried quivers with 60 arrows strapped to their backs and horses. They also used files to keep their arrowheads sharp. 
To capture fortified cities, the Mongols used advanced siege technology. They utilized various siege machines and massive crossbows. During the siege of Nishapur in 1221, they used thousands of these machines. The Mongol leader Hulagu Khan brought 3,000 giant crossbows from China. He also used a team of Chinese technicians to operate an 'ox bow.' This massive machine could shoot large bolts for 2,500 paces. In other battles, they used gunpowder weapons like fire-lances and bombs. 
Some Mongol tactics were particularly harsh. They used a method called the kharash during sieges. This involved driving captured prisoners forward to act as human shields. These prisoners took the brunt of enemy arrows and bolts. This protected the ethnically Mongol warriors during the assault. As the Mongols conquered new territories, they integrated local men into their ranks. This helped their total troop numbers grow significantly. For example, many diverse people fought together during the Battle of Baghdad. However, the Mongols rarely gained long-term loyalty from these settled peoples.
Communication was essential for managing such a vast territory. The Mongols established a postal-relay system called the örtöö. This system used horse stations to transfer written messages quickly. It was the first empire-wide service since the Roman Empire. On the battlefield, they used signal flags and horns to send orders. They also occasionally used signal arrows for communication. 
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