"Chieftain: The British Army of the Rhine. Chieftain provides a complete array of British equipment and maneuver units, from Chieftain and Challenger tanks through MCV-80 and Saxon APCs. Not only are the well-equipped forward elements presented, but the light security elements that form BAOR's vital reinforcements are included as well. Chieftain also presents the Netherlands Army, with its uniquely organized and equipped units. Accompanying aviation and engineering assets link Cheiftain directly to Bundeswehr and Boots & Saddles."

Chieftain was the third Assault Series module, and it required Assault or Boots & Saddles to play.

The Assault game system used 250 meter hexes, 5 minute turns, and platoon/section sized units. The other games/modules in the series were: Assault, Boots & Saddles, Bundeswehr, and Reinforcements. One additional module, Close Air Support, was announced but apparently never released.

This description is from boardgamegeek.com, the best for board game information on the web.