Ok, thanks all! I think it's NOT a cascade. Sounds like it's an export violation.
The comments match up what I'm seeing...there's a member of the squad, a potter, who's badly hurt and crutch-walking...and going around punching the crap out of other dwarves. So are some of the other squad members. The problem is that some of the militia are punching hard enough to smash skulls and that's why I was having dead or critically wounded dwarves pop up.
Hope I don't go TS...the worst part...the absolute worst...after the damn baroness filed charges against the huge crowd of dwarves...she went insane, then berserk, then got slaughtered by a hunter.