Protect your lands from invading enemies! They will attack you in waves, moving along the chain. Before the start of the siege, place defensive towers in those places that you consider strategically important. The guns shoot in all directions, so choose points with the best chance of shelling. In desperate situations, you can go to the enemies melee with a wrench or bombs. Defeated enemies will drop health points and parts needed to build fortifications. You can do this in between waves.