Genghis Khan and the Rise of the Mongol Empire

In 1221, Genghis Khan stood on the banks of the Indus, at the edge of India. Then he turned back. He had already built the largest land empire the world had seen. This lesson tells how a poor boy from the steppe got there.

We start with the Mongols and their world. Then we follow Temujin from a hard childhood to the title Genghis Khan, and on to his great campaigns.

1Who were the Mongols?

The Mongols were herders of the Central Asian steppe. They kept horses, sheep, goats, cattle and camels. They moved with their animals through the seasons.

They lived in gers. These felt tents were easy to pack and carry. Families formed lineages. Richer families, with more animals and followers, held more power.

China lay to the south. The two sides traded. The steppe sent horses and furs. China sent grain and iron goods. But when Mongol groups united, trade could turn into raiding.

• Mongols were herders of the steppe.
• Home: the ger, a felt tent.
• Trade with China could turn into raids.

2How hard was Temujin’s early life?

Temujin was born around 1162. Historians say anywhere between 1155 and 1167 is possible. His father Yesugei was a chief of the Borjigin clan.

When Temujin was eight, Tatars poisoned his father. The family was left by its tribe. They lived in near-poverty on the steppe.

Temujin grew up tough. A young man named Bo’orchu helped him find stolen horses. He became Temujin’s first close companion.

Temujin also made two key allies. One was Jamukha, a childhood friend. The other was Toghrul, a Kereit leader, known as Ong Khan. A later account says he also spent years as a slave of the Jin dynasty.

• Born about 1162, son of Yesugei.
• Father poisoned by Tatars.
• Allies: Jamukha and Toghrul (Ong Khan).

3How did Temujin become Genghis Khan?

Temujin and Jamukha later became rivals. In about 1187, Temujin was badly beaten. He rose again from 1196.

Toghrul then saw Temujin as a threat. He attacked him in 1203. Temujin recovered and defeated him.

He then defeated the Naiman tribe and executed Jamukha. Now he ruled the whole steppe.

In 1206, he held a great kurultai at the source of the Onon river. There he took the title Genghis Khan. Its exact meaning is uncertain. Some translate it as “universal ruler”, but this is only one guess.

He also reshaped the Mongol people. He turned old tribal groups into one army and state, built on service to him.

• Rivals beaten: Toghrul, Naimans, Jamukha.
• 1206: kurultai at the Onon river. Title Genghis Khan.
• The title’s meaning is uncertain.

4How did he attack north China?

North China was split. The Western Xia held the north-west. The Jurchen Jin dynasty held the north. The Song ruled the south.

In 1209, Genghis Khan led a big raid on the Western Xia. They agreed to Mongol terms the next year. The Western Xia were fully destroyed only in 1227.

The war on the Jin began in 1211. A Mongol detachment led by Jebe took the Juyong Pass in 1213. In 1215, the Mongols captured the Jin capital, Zhongdu.

The Jin war dragged on long after. It ended with the full conquest of the Jin in 1234, seven years after Genghis Khan’s death.

• 1209: big raid on the Western Xia.
• 1211: war on the Jin begins.
• 1215: Zhongdu is captured.
• Jin finally fall in 1234.

5Why did he strike Khwarazm?

In 1218, a Mongol trade caravan reached the city of Otrar. The governor accused the men of spying and had them killed. Sultan Muhammad of Khwarazm gave his assent.

Genghis Khan sent three envoys to demand justice. The sultan beheaded the Muslim envoy and shamed the other two. That led to war.

Bukhara’s citadel fell in February 1220. Samarkand fell the next month. The Sultan fled. He died on an island in the Caspian Sea.

At Bukhara, Genghis Khan is recorded as telling the people they had sinned. He called himself “the punishment of God”. The words come from a chronicle, so treat them with care.

The Sultan’s son, Jalal al-Din, fled south. Genghis Khan caught him at the Indus on 24 November 1221 and won a great victory. Then he turned back. Heat, damp and bad omens counted against marching into India.

• Trigger: killing of Mongol traders and envoys, 1218.
• Bukhara and Samarkand fall in 1220.
• Battle of the Indus: 24 November 1221.
• He turned back and never entered India.

6What made the Mongol army so strong?

The army rested on mounted archers. Horse and bow skills were learned from childhood. The Mongols were fast and hard to catch.

Nomads are usually weak against walled cities. Genghis Khan fixed this. After a failed siege in 1212, he set up a corps of siege engineers. It recruited 500 Jin experts over two years.

He also changed how soldiers were organised. Old tribal ties gave way to a new army built around loyalty to the khan.

• Core: mounted archers.
• Siege engineers: 500 Jin experts hired.
• Loyalty to the khan replaced tribal ties.

7How did the story end?

Genghis Khan died in 1227. He was fighting the rebellious Western Xia at the time. After a two-year gap, his son Ogedei took the throne in 1229.

The Mongol Empire grew into the largest contiguous empire in history. It stretched from the Sea of Japan to Eastern Europe. Its later khans carried the story forward.

Genghis Khan remains a controversial figure. His armies killed millions. His empire also opened new paths for trade and ideas across Eurasia.

• Died 1227, fighting the Western Xia.
• Successor: Ogedei, from 1229.
• Largest contiguous land empire.

8What are the exam traps?

A CDS paper asked which Mongol leader did not cross the Indus to attack India. The options named Genghis Khan, Tair Bahadur, Abdullah and Qutlugh Khwaja. The answer was Genghis Khan himself (see Q36, CDS-I 2020). He turned back at the river. Later commanders crossed it.

• Famous name, but he turned back at the Indus.
• 1206 is the title. 1215 is Zhongdu. 1221 is the Indus.
• The Western Xia were destroyed in 1227, the Jin in 1234.
• The war on Khwarazm had a trigger: the killed envoys.