Playing a test game with Norway. The mongols arrived in the holy lands, conquer jerusalem and after some turns a crusade is called by the pope. A lot of western factions adhere and march to the crusade objective.
Problem: there are 5 stacks of crusading armies (hre, france, england, poland, hungary) outside jerusalem not doing anything. All of these factions are at war with the mongols, and jerusalem is held only by 4-5 mongol units. But nothing happens, now it will be like 10 turns without any action by christian countries. Probably the next thing that will happen will be waiting for some mighty mongolian stack to obliterate them without capturing the city.
Has this happened to you? Are the christians sort of scared of fighting the mongols even if they are in huge numerical advantage? Will the crusade go on forever?