Why are you going to use Mounted Sergeants? They have no speed advantage over Chivalric Knights and are significantly inferior in melee.

I'd use 1 RK general (since the royal units generally provide the best generals), 4 Chivalric Knights, two Alan Mercenary cavalry (if you can find them - two Jinetes if you can't), two Pavise Arbalaster/Pavise Crossbows, two Longbows, and five Chivalric Men-At-Arms.