Extra Bonus for getting a perfect war win, and other war stuff.
If your clan manages to get all Stars possible during a war, you should definitely get extra loot. That's extremely difficult to do.
Also, there should be a white flag option in which one clan can surrender. By surrendering, they keep more loot than they would have if they had lost the war, but they still get significantly less loot than the winners. If an opposing clan raises a white flag, your clan would also get more loot for making them surrender.
Your clan would choose when to accept the surrender after trashing up the enemy clan enough to get as much loot possible.
Finally, if all attacks in both clans are used, the war should automatically end.