Took me 1 time And I am lvl 39 LolTook me 4 times to get through it and i am level 44. My 3 Fire bombs attacks before i sent my troops really helped out. I aimed 2 at the towers on top one were the nerve gas cannoms are on the front. 2nd FB to the top right. and one for the mines on the far right. Took Out one rocket launcher on the far left then used my other missiles for the nerve gas cannons. Froze the Towers on the front right side. Once i got passed the mines i went to the left wall and went straight then right. The next checkpoint is more easy i belive it will be the same one for you. 5 level 10 rocket launchers and 1 level 7 rocket launcher