So in my fantasy story, I have a character Kaiza, who is the leader of the army for the protagonists, but he has the mindset of a villain basically. When the main character first meets him, he sees his men as just pieces on a chessboard basically, and is willing to send them to their deaths if it meant defeating the enemy. But over the course of the story, I plan on having him see his men as actual men, and start to truly value them. Trouble is, I am having some problems, and major writer's block over what kinds of events that would make him have a major change of heart like that. Any suggestions?