Shadows of Brimstone: The Lost Army Mission Pack

From BoardGameGeek:

The thunder of cannons sounds in the dark, and sporadic flashes of fire and smoke dance across the night sky as the Lost Army of the dead lays siege to the land of the living! 50 years after the fall of the Alamo, a lost legion of Santa Ana's army has returned! Each of the Mission Packs offered in the Add-Ons menu is a themed adventure set including a new Enemy type, new cards themed for those Enemies, a set of new Missions involving them, and a new Objective Room Map Tile that, like the other map tiles in the game, is double-sided. It has an Old West Mine side and an OtherWorld side, both for use with the themed Missions of the set. Shadows of Brimstone: Lost Army Mission Pack includes 12 Lost Army Soldiers. The Hell Cannon and Crew (1+2 miniatures) is available separately.