I've played many times on breakthrough mode, mostly as a defender. It's very easy to defend the first sector, the opponent never broke through. However I've also played as an attacker, and had a good team thus managed to win the whole game. The first two sectors are extremely hard to get, the rest is fine. The attacker team should have planes at their disposal in the first two sectors, and the defenders should have AA guns in the second sector. What do others think?