AT fire in assault hexes

[cjsiam]

you may be right...I play with 4th, or "Peter's house rules" at this point.

My understanding of the 4th Assault rules are that in an ASSAULT you use the DF, UNLESS you are an AT in which your ASSAULT fire can be AT fire against
an enemy vehicle unit in the same hex....so if you have AT ability you choose what type of ASSAULT fire you undertake as part of the ASSAULT, or response
to ASSAULT.... DF or AT

You seem to be interpreting it as AT FIRE is not part of ASSAULT, I have read the 4th (perhaps incorrectly, ??) that ASSAULT fire can be either the DF or AT if capable.

That do seem to make a difference in how we see things....This is where the "edition" would seem to matter.

Remembering this is a 15minute period of multiple guns/tanks in close proximity to enemy units---it's not one fire....
So folding that into how we view what the mechanic is presenting is part trying to understand this, me thinks...