"Christians, hasten to help your brothers in the East, for they are being attacked. Arm for the rescue of Jerusalem under your captain Christ. Wear his cross as your badge. If you are killed your sins will be pardoned." From Pope Urban 2
The first crusade was the only win out of the 5. Most of people wanted to be crusaders so lot were voluteers the Pope had told criminals and excommunicated people that they would be given a pardon and made free if they came back alive from fighting the Muslims armies in the first crusade.
Fight for the church!!!
The crusaders only won this fight because the Turks were fighting among themselves which made them vulnerable for attacks. Just 30,000 crusaders troops were commanded by a warrior named Bohemond, under his direction these first crusade armies were able to keep at bay an army of 360,000 Muslim Turks. The Crusader armies were very disciplined and organised and fought as one.