Okay, this is probably the roughest start of any mission so far. I actually lost this one in less than a minute the first time in.
If any enemy commanders escape, you lose. You'll want to keep your units separate and vigilantly cover each one. Though the 3rd wave looks hopeless, they seem to take a while to get going. Looking at the map, one of the Great Knights didn't start moving until Shez was done with her part, even though Catherine isn't blocking that path at all.
After you get past the 3 waves, you're pretty much home free!
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