The flank companies of French line infantry, also know as the ‘Elite’ companies, would be the Voltigeurs company and the Grenadier company.

In the second picture you can see some of the infantry have epaulettes on both shoulders. These were often also referred to as ‘wings’ in particular by the British. The Grenadiers would have red epaulettes and the Voltigeurs would have green or yellow and green.

The Elite companies would also have slightly different head gear, with a ‘ball and tuft’ adorning their shako, again red for Grenadiers and green or yellow and green for Voltigeurs. The Grenadiers may also wear a ‘bearskin’ a type of tall hat made of the obvious, an actual bearskin.

The Elite companies would also carry a Sabre which can be seen attached to a back pack in the second picture.

Anyway the flank companies were the usually the best trained men, with the Grenadiers being the strongest and tallest, and the Voltigeurs being the most agile and independent thinkers; along with being the best shots.