If you disposed of all the turrets on the previous mission then this is so easy as to be laughable.
Allow all the reinforcements to arrive and then move the machines slowly through the base.
There is a rather amusing bit where you meet a big door at a T junction. Move all your machines down the side corridoor - place them onto stand ground.
Then use a vortex ballista to destroy the door and the enemy units sat behind it :)
Go find the generator in the middle of the map. There are some objects around the outside that you can kill so it dies a bit quicker - but it isn't really worth the effort!
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