Finally got to game the La Haye Sainte Black Powder game today. Used a mix of the mid-size and larger game scenarios that came with the Warlord Games set. I wanted to add a few more supporting units, to include some cavalry. Here's the set up prior to the game - with a bit of inspiration watching the old Waterloo movie with Rod Steiger and Christopher Plummer.
EDIT: A little more details of the game - the French had two brigades of three infantry battalions each; a cavalry brigade of one Cuirassier and two Lancer units; two horse artillery batteries and several small detachments, including an Engineer/Pioneer unit.
The British, besides several small detachments of KGL Lights and Nassauers in and around the farmhouse had two brigades of two line infantry each, two RHA batteries, small detachments of 95th Rifles and a unit of Scots Greys.
The French started the game as attackers and almost all of the units were successful activating and moving towards the farmhouse. The British in their turn attempted to move along the flanks of the farmhouse towards the French. One brigade of French infantry managed to get through the orchard and up against the southside of the farmhouse in turn 2. While the other French infantry brigade moved into assault against the KGL unit guarding the barn door on the western side of the farmhouse. The French cavalry moved up to the KGL Line on the western side of the battlefield and forced them to get into square. The British Line on the eastern side of the road slowly moved up to support KGL inside the farmhouse. In turn 3, the French stormed into the farmhouse and took on the small detachment of KGL Lights inside. A fire was also started on the roof of the stables which the KGL were not able to put out. The game was called when an overwhelming number of French were inside of the farmhouse and courtyard.
We played four turns, with the French having four battalions assaulting into the farmhouse. Now this probably stretches the basic rules with the amount of units allowed in a building/structure, but we went ahead with it.