#pulling hares

Vastly oversimplifying the situation but

So the character is one of the leaders in a war. The enemy's main army (numbering somewhere around 10,000ish) is approaching that outnumbers her sides army (a little over 2,500ish) by a good bit. Her castles stores are running low and supply lines are stretched. Theyre unlikely to win a direct fight, especially if theyre having to do it while going on rations, but they have a chance (say a 20-30% chance of winning), especially since some of her side's soldiers are undead. Then she manages to captures a decent sized group of enemies (~1,000) in a trap and they surrender. Theyre brought back to the fort. Most of them are career soldiers but a few are conscripts.

She disarms them and whatnot, and they plan to keep them locked up, but realize that they cant afford to feed that many more people. If they keep them, theyll run out of food even while rationing long before reinforcments arrive, and the war will be lost. If she lets them go, theyll just join up with the main army and then theyll Definitely be fucked.

Not seeing any other acceptable options, she has them killed in cold blood, then uses necromancy to raise all their corpses as soldiers, letting her side win the war.

Her side is definitely morally better, but not like, clear-cut Good. The enemy is the traditional fantasy absolute monarchy, and has a strong church which outlaws and demonizes necromancy, while her side is a weird mishmash of a constitutional "monarchy" thats really more of a ruling council, with one of the council members being democratically elected. Also, that country allows and utilizes necromancy on a mass scale, which results in a significant improvement in quality of life for most people, which would disappear if the other side takes over.