I beat it, granted not a respectable time. You need to make sure you have three blasters on the front, and sides and I usually try to get one up in each of the towers. Also, drop down three CN's at the start to get higher initial energy. Once you get a defense up, you can terraform at the back of the castle for more energy.
Terps are a great asset here, and it's a good idea to advance on Bertha fire; hence the name of the map.