What? One battalion of champions would destroy several battalions of CS. Which is why battalions would need to be a togglable feature, similar to grouping in AoE1. Just in a proper formation. You'd select a group of units that is eligible to form a battalion and you'd click on a "Form Battalion" button (or use a hotkey). Now, any time you select one of the units in a battalion, you will select an entire battalion. Similarly, with a battalion selected, you would click on a "Disband Battalion" button to un-group the units. It's simple in theory, but the implementation will be more complex (as will be adding any bonuses to units in a battalion).

Sorry, I was in a hurry. I mean that, at the moment, a champion unit can fight off a few citizen soldiers, and look cool. But a battalion of champions fighting several battalions of units looks less cool, and makes champs seem less important and special. Hyrule Conquest units are only cannon fodder because of the battalion system, as you would see if you were to compare HC to my remake of it (which is using the same damage and health values most of the time). Battalions also mean that civs should start with a battalion, so then why is there only in building to start… and it would mean removal of Citizen Soldiers, or wasting your troops, as you would have to order an entire battalion to gather resources or build a house.

Okay, but that was H:C, not 0 a.d.  0 a.d doesn't have cannon fodder units. H:C did. And your criticism sounds nonsensical. A battalion of Champions would look "overwhelmed" by armies of battalions? What does this even mean? How is this a coherent criticism?   I mean, yeah...

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).