I know there’s deleted footage of Han, Leia and Chewie infiltrating the base on Endor, with some of the other Rebel soldiers in the background. This footage would require some work if it were to be incorporated into a fan edit, because it’s very raw (proper sound effects would need to be added). But at least it shows the other Rebel soldiers actually existing and doing things, if only very briefly.

https://youtu.be/gJqRPV19vKM?t=303

But this is inside the base, not in the forest. It’s also one of the few scenes on Endor that actually has a “military commando special-ops” vibe befitting an operation to take out an enemy shield generator. Hilariously, it also highlights the absurdity of Han Solo not wearing military camouflage gear like everyone else, because you know he’s way too cool for that.