The Crusade to End All Crusades

The People's Crusade is part of the First Crusade and lasted roughly six months from April 1096 to October. It is also known as the Peasants' Crusade or the Paupers' Crusade. Led by Walter the Penniless and Peter the Hermit, the army was destroyed by the Seljuk forces of Kilij Arslan.

The people at home also liked to kill Jews during the Crusades, though the clergy condemned it. Why go all the way to the holy land to kill a non-believer when there were all these at home? And you more than likely owed them money. It was explained to me as burning down your credit card company.

Of course, I'm not endorsing Antisemitism, this is just a way to understand it in medieval Europe.