If you want the "win the war player" in the fight... make killing/fighting something useful to the war.
For you civilians who have not been to war, combat works basically like this. If you're the attacker you win when all the defenders are dead or run away. If you're the defender you win by killing so many attackers they can no longer afford to keep doing so... A long the way... you drop bombs on everything that is useful to the other side, factories, ports, fuel, ammunition depots and anything else that keeps him resupply and in the fight. Because you are trying to take him out of the fight.
The problem with the Aceshigh war is no matter how many planes, tanks and bombers are destroyed.... nobody ever runs out of equipment.And this is the biggest flaw in how Aceshigh simulates combat in the main arena.