Number of figures involved, based for Shako II ruleset as main rules the club uses for 28mm Napoleonics.French:41 Battalions of Infantry (18 figs each)
12 Regiments of Cavalry (9 figs each)
10 Artillery pieces with crew
Approx 20 skirmisher stands (up to 4 figs each)
Command stands
Casualty markers
British:22 Battalions of Infantry (18 figs each)
2 Battalions of Guards (24 figs each)
6 Regiments of Cavalry (9 figs each)
12 Rifle Company stands (3 figs each)
4 Artillery pieces with crew
Approx 10 skirmisher stands (up to 4 figs each)
Command stands
Casualty markers
Spanish:7 Battalions of Infantry (18 figs each)
1 Battalion of Grenadiers (12 figs)
3 Artillery pieces with crew
2 Regiments of Cavalry (9 figs each), guest appearance by Dutch/Belgians in bicorns.
Command stand
Casualty markers
So in total around
1840 figures all told.
All totals are approx correct I think