OK.I'm at the fortress.I've killed all defenders and tanks.Now how do I get in.I've hit the main gate with everything.I've also destroyed the drain gate.

If you destroyed the Gate with a c-4 then get all suviving team mates to the gate

Same problem, except I have tried C4, landmines, LAW, the lot, I can't blow open the drains. Presumably it IS the concrete block construction with the slime spilling over it, past the bridge (on the return trip) on the left???

this lvl is simple. i have beat the game about 5 times. After you destroy every thing and you get up to the main gate, you will have to go around the fortress to get in. you may see a path that leads around near the bottom. DON"T GO THERE! go back down to the buker on the right side closest to the fortress. from there you can go up by going straight or go to the right. Go to the right and travel along the path. you will get to the bridge you passed at the begining of the lvl. kill the guys and keep following the path.

I cant even seem to get to the fortress... is there any health packs hidden around, i deperately need them. and just one more thing, DONT use up all ur LAWS, U start with 2 and u need both of them, i found out the hard way why, i tried to blow up the secong tank with every single weapon except for the C4 and LAW