Okay so thus one isn't exactly a fact, more like something Warriors related I fell like I should share.

In Crookedstar's Promise, it said that the medicine cat knew Crookedstar was supposed to be deputy because of a broken jaw on a pike in the fresh-kill pile.

Buuuuutttt..... This is the size of a pike:

RiverClan must be more skilled than we thought if that was on their fresh-kill pile!!!