What happens to the troops that survive each battle?

All surviving troops will remain behind to hold the conquered island against enemy counterattacks. 

Thoughtfully deploying troops to win battles is at the heart of Battle Islands' strategy! Think of them as valuable resources to be spent wisely. You should plan every battle carefully and try to use the right number of units for the right situation. 

Throwing them all into combat without considering the cost can lead to victories where you end up losing much more than you gain!