Updated: Dec 28, 2020
War Commander Bases | Do Upgrade Tokens Expire?
I don't think they expire, but if you don't use before next War Commander event you wont be able to get more, there is a max limit as a total owned.
Opponent has my War Commander base surrounded too and when I go attack them their platoon isn't there. then i get my War Commander platoon defeated. What do I do? am I being cheated on?