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I've lost this mission four times and I don't know what I'm doing wrong. I use mechs on hills to attract and delay enemies, and all the artillery to hurt the most dangerous units, but they're too many. The center passage is too wide at the top, and my rocket launchers can only move 2 steps per turn anyway, so I can't clean up the mess.
On your first turn just get your Rockets and Artillery right up against to the mountains and as close to choke points as you can. Usually it's not best to move them at all, but if you do move them North along the mountains since that's where Lash's units will be going.
Put your most defensive unit on your HQ (tank/MD tank) and weaken/kill units that would be able to damage that unit (fire at Tanks only once, take MD tanks out if you can.