Their first task was to scout the terrain in order to determine position of British troops.
Or as Emperor himself told at the staff meeting: "You just get the mice to sniff their noses out of their holes, Monsieur Niegolewski. Then I will send the cats to do the rest."
Finally I have enough 6mm models to play my first game of Muskets and Shakos. Of course, I am heavily depending on the rule often mentioned in the book - play with what you have. So, Niegolewski will scout the terrain with one regiment of Polish guard lancers (rep 5) and one battalion of French line infantry (rep 4). As reserves, he might expect additional squadron of lancers or one independent skirmish unit of 6 light infantry voltigeurs (rep 5).
British troops, on the other hand, can field one battalion of line infantry (rep 4) one battalion of Spanish guerrilla (rep 3), two independent skirmishing units of 6 rifles each (rep 5) and one regiment of KGL hussars (rep5).
During that time, my foot battalion marched forward and get in sight of the third PEF, who also turned to be case of nerves.
But then the lack favored enemy. They received reinforcements. It was battalion of Spanish guerrilla, who appeared out of nowhere (as guerrilla usually do) in base contact with my cavalry flank, forcing lancers to retire while suffering heavy loses. Further more, foot company tried to change formation and failed, even with brigadier attached (I rolled 3 sixes), so they also lost some troopers and were pinned in place, disordered.
Basically my elite unit received heavy beating by 2 British low reputation troops and many unexpected things happened, so this was a really good game.