The Campaign/Battle Card Driven mechanic is a relatively recent development in wargames that focuses the players actions on cards they have in their hand. The very basic idea is that performing a single action uses a single card. Games where cards are used to determine the outcome of battles do not use this mechanic.
Holding On: The Troubled Life of Billy Kerr
Your patient has a story to tell. Can you keep him alive long enough to listen?
Use your caballeros to control regions of medieval Spain, keeping clear of the King!