You're on a planet where the war does not stop for survival, have to be included in the battle showdown. You need to protect the base and at the same time attack the enemy and destroy their buildings to the ground. Continuously replenish the army, so as not to give the opponent to start the siege of the fortress. Defeat the enemy in his own walls, and then compare with the earth fortifications. Do not miss the opportunity to make new monsters harder to stronger base.