What did the church promise people who went off and fought in the crusades?

The church promised those who fought in the Crusades spiritual rewards, including the forgiveness of sins and a guaranteed place in heaven. They also offered indulgences, which were reductions in the time spent in purgatory for sins. Additionally, participants were often promised material rewards, such as land and wealth, as well as the chance to serve a noble cause by reclaiming holy lands. These incentives motivated many to take part in the military campaigns.