An HK stack defines its tactics, as opposed to a siege stack which stays static on a holding, a Hunter-Killer stack roams around the enemy provinces looting and destroying small units [hunting and killing] before they band together to a size where they can threaten your own.
It's not necessarily huge, but you want to keep it on the move in case it has siege events happen to it. Successful HK is crucial in depleting a numerically superior enemy's levies so you can defeat them. Hope that helps.
It's not necessarily huge, but you want to keep it on the move in case it has siege events happen to it. Successful HK is crucial in depleting a numerically superior enemy's levies so you can defeat them. Hope that helps.