thats not the last mission

confused me until i actually looked at the mission names.
what i did was i first used andy to kill everything near the left side of the base, using hit and run tactic. and doing that to other units i see too while leaving the raiders in a safe spot.
with the raiders, raiding all the generators is a MUST. since towers guard the hq. what i did was, i waited a little bit for their miner to make some money, then i captured their VTS, warehouse, and generator at top left. made some eagles, and with the eagles and andy, i went around the base to the right side and captured the buildings there.( and getting any power generators i could) sold those buildings and made more eagles, then by that time, their power was too low for the towers and i just killed the surrounding units and captured their hq.
what i recommend is getting the VTS, generator, and warehouse, build eagles. then raid any generator you find until they run out of power. then just take the hq with the eagles and raiders while leaving andy in a safe spot.