defence ,attack which is better

The advantage is very very slight, I cant remember how much but on less you are fighting 500 armies against 500 you might as well say it is 50/50.

If I know my army will be attacked next turn I will attack first just for that tiny percentage chance

this is result for 3 attack 2:
att=2890 and def=2275 and draw=4886
u see while u att it often draw and win is higher def.
4myGod u should write a method to calculate it.
i have attacked more after i have this result.