If you are taking part of a "rush", don't back out.Think of it like an RTS. In the original Command an Conquer, if you selected a group of tanks to rush the enemy, and most of your tanks turned away and ran, would the "rush" be effective?
No, and the same applies for this game.
Too many times I have seen 3-4 Mammoths ready to rush, then when the rush takes place, 2-3 of the tanks will turn tail and run when they notice the leader taking damage.
You will DIE in a rush, but you will also take out the enemy buildings if you ignore everything but the target.
When you Rush, DO NOT STOP BECAUSE YOUR PAINT GOT SCRATCHED!!!