Question

Which city appears to be the focus of the crusaders efforts?

Answer 1

the term Crusade was originally applied solely to European efforts to retake from the Muslims the city of Jerusalem, which was sacred to Christians as the site of the crucifixion of Jesus Christ.

Answer 2

I'm assuming you mean Christian Crusades.. so their main focused city was Jerusalam, becasuse it was supposedly Christian Territory, or rather that it should be.