Can't solve Construction Yard level
Hi everyone,
I'm having trouble solving the Construction Yard level.
I can't get rid of the viruses near the construction device itself. The Virii and Centipedes wouldn't be a problem, but the Spiders attack me as soon as I get a squad there. Generally I manage to kill one Spider per try (I have to blow up my squad with grenades detonating nearby, as the Spiders immediately jump right into my squad and don't go away anymore), but getting a squad there activates the egg shooters. So as soon as I get the next squad there, there's at least one new spider. But as long as the Spiders are there, I can't get close enough to kill the shooters.
My next control tower is far away and it takes some time until the squads reach the battleground. There's no other tower nearby, except the ones at the two incubators near the construction area. However, I can't get engineers there, as the Virii immediately kill them.
I've been playing this level for hours now and I just can't solve it. Anyone knows a solution?