It's really frustrating 'cause I'm a slow player and like to take my time, develop my base to the max, etc.

1.) Destroy their base.

Do not destroy their oil derrick. You can use it so you can build 2 power stations

3.) Build 1 force wall so their army will attack that. Then you can kill them with your original attack party. You should only get 1 attack anyway.

4.) Build a transport dome and put a Doom Dome in it. Then fly it over to their base and start shooting up their ant tankers (oil tankers). If 1 unit comes to defend them, just kill it. If a small army is coming load the Doom dome in the transport and fly away. When they move off, then come back and do it again.

After you kill their resources. You have their defense towers left to deal with.

Best thing to kill the Touch of Deaths are the Michealangelos. Load them up in a transport, land the transport right next to the T.O.D and then boom. For the Worms, you can just use Weed Killers.

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Usually I try to minimize losses, so it takes quite some time for me to finish a mission.

Btw, a useful thing I found:

The Series 9 Constructible Plasma Turret (it takes only 5 space) is great against buildings. I usually build a Large/Plasma/armor/speed tank or two, load them in a transport dome and land it outside the enemy base. These things have a really good range (bigger than the anti-infantry turrets) and what's even better, they take out buildings with ease. A Kneecapper takes two hits to destroy for example...

In the mission we spoke earlier, I used one of these tanks to land east of the evolved base, where the Kneecapper is. I took out all the cannons there, then moved to the peninsula where on the other side the enemy refinery is. Now, it took only ten or so shots to destroy it, and by the time it blew up, the whole evolved army (lots and lots of Death Hippos and Missile Crabs) was on my tank's neck. So I loaded it back into the transport and flew home, while my other transport flew 10 Michaelangeloes into the now empty base. I wanted to blow up the clan hall, but it was too cramped around with buidings, so they ended up blowing a few barracks and a Beast shop instead.

Now the enemy was producing units like hell, so it had no money. It tried to rebuild the refinery, but there was no money so it was put on hold.

Meanwhile I used my Plasma tank to destroy other buildings I could reach from the other side of the river. Then I launched my assault, lots of Doom Domes, a few Cauterizers, backed up by two MRU's (mobile repair units).

An attack by my plasma tank lured the enemy's few remaining units out, and I destroyed them without any casualty.
Then I transported my two plasma tanks and an MRU into the base, destroyed all the buildings outside the reach of the Touches of Death. One plasma tank can destroy a Worm with getting only damaged to yellow.

Now I transported as many units as I could into the base, took game speed down to min and attacked the ToDs, plasme tanks behind, drawing back the wounded for repairs.

Plus by the time they even get to the Worms, other nearby towers will start killing them, and it takes also time for them to get into attacking position because of their close range. I only use them for cleanup after all the enemy units and towers are wiped out.

Btw, I just finished the next level (Islands in the stream) with only 9 casualties (and most of those were the original infantry). I transported Artilleries on the two small islands abowe the main Survivor base (after wiping out the towers there) and used them to destroy the AA-towers and laser destroyers, and their machine shop as well. Afterwards I landed with a party of 2 Reapers, 5 Sterilizers and an MRU on the west coast, and wiped out the incoming infantry. After I destroyed the AA towers, my Crop Dusters took care of all the remaining enemy forces.