horse-drawn oil well ambush sabotage The army is large, but it is moving very slowly. Near the back, you can see a few horse-drawn wagons carrying boxes of gunpowder that you could sabotage. Without those, the invaders could not fire any of their weapons. Also, they will pass by your town's oil well. That might be a great place to ambush them. I will sabotage their gunpowder I will start a fire in their path.