Sure.Ciri. With a decent amount of luck.
...The Wild Hunt are posers really. Ever since Ciri destroyed Eredin in the books, I have been laughing them off...
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They'd be cannon fodder. You have to keep in mind that battles in games are always scaled down. You can't have a battle with 1000 men in a game because of rendering and design issues. I see your 100 Nilfgaardian soldiers, and raise you 1000 of the best Wild Hunt soldiers to fight along Eredin's side.I imagine that a single soldier would have trouble defeating a witcher, but Emhyr offered a banner. Emhyr wasn't going to send 2-3 guys, he was offering a banner which (as far as I can glean from wikipedia) consisted of close 100 people in medieval Poland. So 100 soldiers under the lead of an experienced general might have been a massive help.


