Use the Rally Button to get all of your troops to attack or march the same area.If you do not destroy all defensive buildings - your surviving troops don't return after battle and you have to retrain them.Mercenaries do not return after battle.Battle opponents are chosen by the game using your medal count and age - your opponents will get stronger the more medals you get.If the defender looks too strong, don't attack Find a weak spot and don't attack where the defenses are the strongest.When you face an easy opponent, go for all his defenses so you don't lose your army
Then, go for the Town/City Center for an instant win by rallying.