Fighting a battle when the enemy waits for me from its camp is a battle I don't like to fight because it causes many casualties ( unless I use 2 armies to have a significant numbers advantage) and specially if I can't allow to have high casualties even if I win ( because for example my army has some experienced units that I need them for taking out another army in the next turn )
But when the numbers are either approximately equal or the enemy outnumbers you slightly, how would you organize your attack to the camp?