The group of wounded dwagons had three uncroaked warlords. The "Merge Phat-Singh and Manpower's stacks." comment would seem to suggest that they were formed up into three stacks, one per warlord (each stack has a warlord, so none of them are forced to autoattack).
Ansom's main issue was that he didn't want to write off the remaining siege units. That said, Vinny's "We'd make it. I think." comment suggests that Ansom, Vinny, and Vinny's bats against six unled dwagons would be a fairly close battle.