I hate this level with a passion. It's not even fun after you've exhausted every single thing you could do to win. How are little bat swarms stronger then 5 Vultures? Rofl...I laughed hysterically when the little buggers destroyed all 5 of my vultures, aren't they they most expensive, strongest, and advanced gunships in the UNSC!? I go in with upgraded Scorpions, and the juggernaut flood dudes surround me!! Preventing the tanks from moving!  This level is a product of a serious game-design flaw. It's not winnable on single player (legendary).  Please someone prove wrong. I've tried everything upgraded...scorpions, hornets, vultures, gauss hogs, Number 2 cryo Bomb to kill swarms. Nothing works.

Try using those units together instead of apart.

I would assume you need to micro-manage as well.

Scorps and wolverines with cryo worked for me.

Easiest thing to do is to just put all the buff skulls on. 

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I am Aloysius's best cub scout!

But now I have a new heart to win over.

turrets do a huge amount of good on that level

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I only play 3v3 standard. Highest Overall ranking: 2nd.