I played this game on stream: https://www.twitch.tv/videos/2560917305?t=00h01m37s
Overall, I found that the game balance may be a little off. It was quite grindy / draggy, with a lot of back and forth and not really gaining much ground. Perhaps that's why the game is called Attrition :D
I think having some way to choose where to spawn new troops would be good, so I can choose to spawn my soldiers in a forward position even if the base has empty spots. Otherwise, it leads to me losing the front spot and having to grind forward again.