it is the easiest game ever. Just concentrate all your forces on the top or bottom and bomb the opposite side. In this case your forces will reach the enemy's wall fast and you will win fast. I did it 3-4 minutes. Boss was easy!
its not boring , it is pretty fast.
Really. Just try to walk with your bowmaster... The tactic is pretty simple and then you can win fast and get your hard badge in 60 minutes or less.