@Gurken Khan it can be fixed by giving them a "selection group name". I'll make an issue.

Well, it's not what I expected, and I don't think I've had it before. And frankly I don't like it.

Not specific to a27.1. Not really a bug neither. A variant of the marine seems to have been created in order to make it unlocked by default in PII in the gymnasium.  https://gitea.wildfiregames.com/0ad/0ad/commit/ba635f2790762fbf74541013a6247619519c0ebc

My marines are not bunched together. I think one batch is from the Gymnasion and the other from a dock, still... (Ctrl group 4, should anyone bother with the save.) savegame-1900.0adsave

Almost never. "That city is well fortified which has a wall of men instead of brick." Why would you wall off a wood line? It's full of soldiers. You can build palisades in neutral territory though if you want. Towers: Usually zero, but they are much more common than palisades let alone walls ;-) The most effective way to use walls might be to chose Iberians ;-)

Do you wall in often? What is your solution to walling off wood lines? How many towers do you usually erect to support the boom? Any tips to wall in effectively in 0 A.D. are also welcome.