The Clubman is a non-playable light unit that shows up at the beginning of the game, and is used by the owner of the first province (Herse Baugneson) that the player encounters. In battle, it looks like a HMA Berserker.
It is greatly inferior to the Spearfighter.
Trivia
This is the only unit in the Stone Age.
Other Military Units
Legend: = Light Unit Class = Ranged Unit Class = Artillery Unit Class = Heavy Unit Class = Fast Unit Class