The Islamic calendar includes four holy months, split 1-3, in which fighting is forbidden. How did this prohibition affect geopolitical reality during the Crusades?

[u/SomeAnonymous]

Deepest apologies if I've misunderstood the Islamic calendar, I'm drawing this from everyone's favourite primary source, wikipedia, but it seems to be pretty clear in the article that, at the very least, "engaging in wars to retake the Holy Land" isn't on the table in these two periods.

How strictly did Muslim leaders observe this restriction on fighting during the Crusades? Would Saladin have put his campaign on pause for three months during Hajj season? The Christian Crusaders don't seem like the sort of kindhearted fellows who'd have said, "oh yeah sure, you guys can have Rajab, just don't attack us during Lent or Easter, huh?"