Looking for a story

I'm trying to find a story I read a while back, maybe 2-4 months ago. It's Sci-Fi, about a General returning to Earth to be court martialed for losing a battle to take a planet. The one who organized the defeat was a former academy friend that saved him some 30? years before and was left behind with some other wounded. He was changed by one of his captors into a daughter. They were called elves, and were one of the oldest races in the universe.

This former friend was 'caught' and is travelling with him on a shuttle to Earth. She tells him her story on the way.

Any help would is appreciated.

Thanks,

Mark <3