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if that is the one with the extremely large tank then I'll do my best. First goal should be to kill the turrets on the big tank as well as killing the troops on the cliff using a sniper and perhaps an assault. You should probably have atleast two lancers ready to take out turrets on the tank. Once the radiators show up it'll be easy to run lancers up the ladders and take them out.
Basically you only need antipersonel troops take out two waves of enemies, everything else is dedicated to taking out that tank. It's useful to have an engineer to restock your lancers once they get low. Dealing with Silvaria basically amounts to trying to make sure that noone that can die is within her eyesight (so only a tank can be within her eyesight).
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