Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
If you can, move your units to safety after they've attacked.
Remember to build spirit walls to keep your commander safe.
If you're stood near the edge of a cliff, it might be best to move or you could end up pushed off.