At first, Pope Innocent III was unable to cope the lost of Jerusalem. He energetically preached for the Fourth Crusades.
Heyy!! Let's cooperate!
I HATE THIS OLD MAN!!!!...
They are going to Jerusalem through Egypt to claim Jerusalem back.
Good job soldier!
Arghhh... It's the Byzantium...
They conquered Egypt on they're way to Jerusalem to weaken the Muslim troops in Jerusalem.
We are defeated??...
When they wanted to go to Jerusalem, they changed ways to the Byzantium area. They arrived on January 1203. They immediately met with the prince Alexios Angelos and cooperated to help him claim Constantinople with money and military service as reward after claiming Constantinople.
I DON'T WANT TO COOPERATE!!
The troops arrived at Constantinople on June 1203.
This guy is weaker than me!
The Byzantium troops started the fight and with the help of Europe troops, they managed to conquer Constantinople.