William the Breton, French chronicler of the 13th century, mentions in his Philippide (Book XI, l. 613-624) that, at the end of the battle of Bouvines (1214), Philip II of France sent 3000 Mounted Sergeants with lances against the last remaining 700 'Brabant ' infantrymen of Renaud de Dammartin, Count of Boulogne :
"ter mille clientes Hastis armatos in equis" = 3000 Mounted Sergeants with lances(in latin)
Que res ut regi patuit, ter mille clientes
Hastis armatos in equis emisit in illos,
Ut perturbatos stationem solvere, seque
A tam perplexa faciat laxare corona.
The Philippide is the classicizing Latin epic poem of another of his writings written before it : the Gesta Philippi H. regis Francorum in which he didn't mention this episode. Some French historians believe this happened, some don't, other don't decide on/against it. I for one won't decide.
However, it is interesting to see that the idea of 3000 (which is a lot by the standards of the day) Mounted Sergeants fighting at the same time on a battlefield without being headed by any Knights seems to Le Breton at least plausible, believable enough to write it and to be read by his contemporaries.
As a reminder, there are in game a few units of Mounted Sergeants in the lists of the 1200's which seems sensible.


