Hey, unfortunately this is a known issue which we’re currently investigating.
For more information (and a list of info that we’d find helpful in helping to pinpoint the issue), please see this article:
https://gemsofwar.zendesk.com/hc/en-us/articles/360000305315-Enemy-troops-do-not-die-and-the-game-is-frozen
If you’re missing rewards due to this issue, please contact support so we can help you.