This game completes the Waterloo series of games which includes Ligny, Les Quatre Bras and of course Mont St Jean. The game does of course involve the exploits of the right wing of L'Armee Du Nord on June 18th.
It can be played independently of the other games or linked to be simultaneously resolved with Mont St Jean.
This description is from boardgamegeek.com, the best source for board game information on the web.