Our alliance is looking to do an AvA war but we need to know how many players do we need to play one? Is it different depending on the map you choose or is there only one map?

Well I was mainly thinking about when you challenge another alliance. In a 22 player map, can you set it all the way up to 11v11 or is it limited to a 5v5 or can you do any #v# up to the max?