Your units will automatically return to your base after the event.
Or you can get them back by:

- Click on the Unclaimed Land icon that appears on the right of the screen, then click Confirm.
- Retreat your troops from inside the occupied buildings, and you will automatically go to the army details building in the event.
- Click on the building and retreat the troops from it (click on the troop withdrawal icon).
- Click on it turn your troops back to your base successfully.