Byzantine empire worried over Seljuk Turks growing power. They send a cry for help. Turks take over neighboring kingdoms. Crusades begin to stop Turks.
We will take over your kingdom!
We are the scary Seljuk Turks!
Byzantine's cry for help answered by Pope Urban ll. In order to get soldiers, he promises men who join have VIP access to Heaven.
The goal of the first crusade was to re-conquer Anatolia, the Holy Lands, and the kingdom of Jerusalem.
Send them to Jerusalem!
The main force that made it all the way to Jerusalem, started out as an army of 4,000 knights on horseback and 25,000 infantry. These numbers decreased dramatically due to losing men during the journey.
We are taking over!
Once they arrived, the army managed to get over the wall and open the gates, capturing the city and slaughtering many Muslims, Jews and Christians in the process.
No! Please don't!!
I am going to kill you!!!
Eventually, the lost land was won back. The Muslims retaliated, prompting several successive crusades and the Christians remained in control over the Holy Land for about 200 years.