This is a mod in which every single troop in the player's army has a persistent identity. They have a name, face, equipment load-out and origin information that are generated on recruitment and will persist over time. They also have stats that are updated with each battle. While all troops are unique, they still remain together in stacks in the player's party (so if you have 50 Swadian Knights, this will still show up as one stack, but all 50 will have their own unique name and info).
This video shows the mod's custom battle feed (enabled from the camp menu) that displays the names of troops getting kills or being killed.