Yeah, I’m surprised this feature hasn’t been implemented into 0 A.D. yet. At the moment bridges are just actors that are placed on land to look like they are bridges, the 0 A.D. team should try to get bridges working for A28.
NNNNOOOO BBBBAAAATTTTAAAALLLLIIIIOOOONNNNSSSS!!!!
Believe me, I have seen how battalions ruin 0 A.D. @Exodarion added them for Hyrule Conquest, and they ruined it. They made weaker units feel like cannon fodder that's only purpose is to march to their doom, and stronger units feel less unique, as having a group of Champion units (which, in HC, are often monsters or demons) looks like they are overwhelmed by armies of battalions.
I think Battalions could only work in vanilla 0 A.D. if they simply are an updated version of Formations (which are, in a way, just Battalions).