Here's the situation:
- My opponent's cavalry attacks my infantry
- I play a first strike card
- I don't roll the right dice to cause a cavalry retreat, and my opponent now attacks
Are my infantry allowed to form a square at this point?
It's an either or situation.
If you the play the First Strike card, then your committing to a full compliment of battle dice(based on your block #)& you're battling first. If you choose to go into square, then you only roll one die (regardless of your # of blocks) & you get to battle first.
If you would be able to do both(First Strike + square) then you would actually be battling twice before the original attack could take place.