Ooops... you seem to know about Napoleonic customes, hehe...
I did never saw a picture of soldiers from Napoleonic wars with tricornes, that's why it seemed unsound to me. But you are right they can well have been used, after all, Napoleon begun fighting few years after the French Revolution, where these hats were clearly used.
And I want to ask something: I thought the bicornes were used by higher ranks, but... where they also used by the soldiers??
I also started a thread in GW-PC forum on flags, asking which of the Playmobil flags, from Medieval and later times, really belonged to a state or feud. I am also much ignorant on this, I expect somebody, overall German or French, can answer the questions on the Medieval flags.
All the best.
Pyrrus