Long ago, a big city was called Baghdad. 
Long ago, Baghdad was a very famous city. 
Then, a large army came. The leader was named Hulegu. He led a very big group of soldiers.
He wanted to take the city. The people in the city did not help him. This caused a big fight.

After the fight, the city changed. It was not the same as before. Do you like learning about old cities?
Baghdad was once a great city. 
In early 1258, a Mongol leader named Hulegu came to attack. He led a huge army of over 138,000 men. Hulegu was a grandson of Genghis Khan. He wanted the ruler of Baghdad to help his army. The ruler, called a caliph, said no. This led to a big war.

Baghdad was once one of the most important cities in the world. 

In the early 1200s, things began to change for the city. The Abbasid leaders slowly lost their power. Other groups, like the Buyids and Seljuks, moved into the area. Even so, Baghdad stayed very large. It had over a million people living there. By the time the Mongols arrived, the city was a famous place. However, the leaders in Baghdad were facing many problems. There were fights between different groups of people in the streets. The city's walls were also in bad shape from floods.
In 1251, a man named Möngke Khan became the Mongol leader. He sent his brother, Hulegu, to move west toward Persia. Hulegu was the grandson of Genghis Khan. He led a massive army of over 138,000 men.
The attack on Baghdad began in early 1258. The Mongol army surrounded the city from all sides. On 17 January 1258, the Mongols flooded a camp belonging to the city's soldiers. This helped the Mongols win a small battle. After that, they started a full siege of the city. The Mongols used huge machines to break the walls. They used stones and even burning materials to attack. By 4 February, the Mongol troops controlled the eastern wall. The city's defenders were left with only about 30,000 troops.
The siege ended in February 1258 when the city fell.
The Siege of Baghdad was a major military event that occurred in early 1258. It involved the Mongol Empire attacking the capital of the Abbasid Caliphate. This city was a massive center of culture and wealth. The fall of the city is often linked to the end of the Islamic Golden Age. During this period, Baghdad was a place where science and philosophy flourished. Scholars used new technologies like paper to study the world. 
Baghdad was founded in 762 by al-Mansur, the second Abbasid caliph. He chose a location near Persia to protect his dynasty. Because of its trade routes, the city became incredibly rich. It eventually grew to house over a million people. This made it one of the largest cities in the world. It featured famous learning centers like the House of Wisdom. 
In 1251, Möngke Khan became the leader of the Mongol Empire. He sent his brother, Hulegu, to conquer the west. Hulegu was a grandson of Genghis Khan. He led a massive force of at least 138,000 men. This army included many different groups of people. It had Armenian troops and military engineers led by Guo Kan.
Before attacking Baghdad, Hulegu fought the Nizari Ismaili Assassins. This group was a secretive state in the Elburz Mountains. They had even tried to kill Mongol leaders in the past. Hulegu's forces captured their strongholds by late 1256. After this, Hulegu turned his attention to the Abbasid ruler, al-Musta'sim. The two leaders exchanged letters that were very tense. Al-Musta'sim refused to help the Mongols with their campaigns. This refusal led to a decision to overthrow the caliph.
The actual siege began with several strategic moves. In January 1258, Mongol forces flooded a camp of the city's soldiers. They did this by breaking the dykes of the Dujayl Canal. This caused many soldiers to drown or be defeated. The Mongols then surrounded Baghdad from all sides. They built a wooden wall, called a palisade, around the city. They also dug a moat to keep people from escaping.
To break the city, the Mongols used advanced siege engines. These included mangonels and ballistae, which are large machines that launch projectiles. They built brick mounds to give these machines a better height. The Mongols used stones from the Jebel Hamrin mountains. They also used pyrotechnics, which are materials that burn, like naphtha. By February 4, the highly-trained Mongol troops controlled the eastern wall. The city's defenders were left with only about 30,000 troops.
Al-Musta'sim tried to negotiate, but Hulegu wanted total victory. The city finally surrendered on February 10, 1258. Three days later, the Mongol army began looting the city. The loss of life was very high. Hulegu estimated that around 200,000 people died. The exact number is unknown because of subsequent epidemics. After the fighting, Hulegu executed the caliph on February 20.
Despite the destruction, Baghdad's history did not end there. The city eventually became part of the Ilkhanate, a Mongol state. While it was no longer as wealthy as it once was, it still prospered. It was less powerful than the new capital, Tabriz. The siege remains a key moment in the history of the Middle East. It shows how the movement of massive armies can change entire civilizations.
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