I am not reviewing my earlier statement here, but I will add some strategy on how to win this, since I tried again recently after strengthening up considerably since my previous effort.
1. attack the scouts. They are easily killed and about 30m points on rookie lvl.
2. Only use onslaught to attack the towers with warriors, and only enough for the win. No need to clear a tower to win. This way you reduce your losses heavily. If you have the last turn for attack, you can actually calculate how much kills you need.
3. I didn't try this yet, but I'm going to use increasing lvls of troops per consecutive onslaught, from T4 To T7 per attack. This greatly reduces the cost as well.
Have fun
thats a bit hard to do these things especially when the towers appear after theyve been burned or when you dont see towers until lvl 10s are out.
