increase army movement amounts, 999 is not enough [Done]

A couple of friends and I are playing a game in which we are attempting to build up as many truops as we can before we finally duke it out for victor. I have just topped 1000 troops, but found that i was unable to advance all 1000 at once. It would keep saying illegal attack move. I had to advance 999 and then fortify the rest. Doing this is fine for now, but when we battle, it will be crippling to not be able to advance all of our troops.