To be fair, anything after the second crusade was just glory seeking and plundering. But yeah, The Sultans' armies lay waste to Spain, Italy is under seige and the city of Rome is about to fall, and Byzantine is being sacked and -blam!- while screaming for help so Europe's poor men sell everything they own to purchase a sword and provisions so that they can defend their home and later be remembered as religious zealots who for no reason layed siege to Damascus.