This is the last mission for the original skirmish that was released back in 2014. Since then there have been some updates which made it a bit harder to beat so I beat it again in 2015.
Only the Wolf (last enemy lord) remains on this save file. This file is intended for people who just want to have the achievement but they don't really want to put in the work to figure out how to beat this mission.
Difficulty is set to Normal.