Sophia haterz. She doesn't take that much work to baby you just need to pick your spots right, weaken guys up for her, and shoot for some deathblows that have only like 60% to hit with her and hope you get lucky. Once she gets a few levels she's usable.
Anyway I'm pretty sure my strategy for this map was "ignore the gaiden chapter and drag my ass" but I'm not sure. The 25 turn limit isn't too restricting, though. Once you know where the units actually are it becomes manageable. Which is the big problem with this map it's more memorization than real strategy since Wyverns fly in from offscreen even with torch/a thief and stab you if you're not careful. I'd dread the hell out of this map if I was playing iron man style, though. (which I usually do for the most part unless my death resulted from "I couldn't have possibly have planned against that without advance knowledge of the map" which uh... applies to most of FE6's maps actually given the way their reinforcements work so yeah I'm not big on it for this one)
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No problem!
This is a cute and pop genocide of love!