MechAssault Walkthrough:
bright lights, dark city II

This is a snowy world. Advance through various enemies to the Icarus. Destroy 2 waves of 2 mechs each at the Icarus. Wait before killing the last one until you gather everything up because when you clear the area, another wave comes in. This wave has helicopters and tanks. Again, leave the last tank and gather stuff after first mech wave, because killing all of them triggers the next wave.

MechAssault Walkthrough, Tips and Techniques