Hah! It's a small world. My mod wasn't very popular, it was a little hardcore for some lol ^^
I've done some very brief wikipedia research, and I conclude as follows:
A "Lances fournies" was a medieval army squad that would have surrounded a knight in battle, consisting of a four to ten man team built of squires (man-at-arms, (usually mounted swordsmen), archers, attendants (pages) and the knight himself. These units formed companies under a captain either as mercenary bands or in the retinue of wealthy nobles and royalty. (
wikipedia)
A "Man at Arms" basically meant a professional soldier, especially a mounted one. Essentially, anyone serving in the TACTICAL role of a knight, mounted or otherwise, would be refered to as a man at arms. Hence it would be fair to refer to the troops recruited at the castle as the "Man-at-Arms" tree.
A Squire was an apprentice knight, and didn't actually fight that much. A squire was responsible for:
- Carrying the knight's armor, shield, sword,and duty
- Holding any prisoners the knight takes,
- Rescuing the knight should the knight be taken prisoner,
- Ensuring an honorable burial of the knight in the event of his death,
- Replacing the knight's sword if it was broken or dropped,
- Replacing the knight's horse with a new horse or the squire's should the horse be injured or killed,
- Dressing the knight in his armor,
- Carrying the knight's flag,
- Protecting the knight if needed
- Taking care of the knight's horses
- Accompanying their Knight to tournaments and during the time of war to the battlefield
- Ensuring the armor and weapons of the knight were in good order
An "Esquire" was a man with the wealth of a knight, who for whatever reason could not or chose not to become a knight. Probably not an important distinction and certainly irrelevant to the mod.
A "Sergeant-at-Arms" was a middle class man fighting in the role of mounted heavy or light cavalry, or as infantry, commonly spearmen or crossbowmen. They were generally rated as worth half a knight. I BELIEVE they would have made up the majority of any "lance", realistically. It might not be unrealistic to make "Sergeants" of all kinds mounted (Sergeant Speaman, Sergeant Billmen... etc), and equip them slightly more knight like. This would certainly justify their expense, and it's really not hard to dismount them.
I might also suggest that all "sergeant" types be recruited from the towns troops, being as they are the middle class of the battlefield, and leave peasants to peasanty type roles, such as archers, skirmishers and crossbowmen. It's not as hard as it sounds, most melee troops would come from towns in the form of "Town Levy" or militia or something similar, and you could split them along offensive/defensive lines before deviating further into say, spearmen/pikemen billmen/swordsmen, or any other arrangement you like. Peasants can then be split into Archers/Crossbowmen, or whatever else peasant levys might be (almost certainly poorly armoured with little upward mobility).
I think this arrangement would suit the recruitment style you are aiming for, and I'm not an expert but it shouldn't be TOO hard to switch around the unit trees so they have different starting units. Your major difficulty might be Archers and Crossbowmen, as I don't believe Sergeant at Arms would ever serve as Archers, they might as crossbowmen (still unlikely however).
I'll do a little more research and see if i can find any info on how peasants were equipped and used outside of archers.
Infantry in the Middle Ages (Wikipedia)
EDIT: Having done a little more reading I think the best way to deal with Sergeants in general is to mount them all. It seems that although they might not have been CALLED sergeants, and it might not be historically accurate in ALL cases, there are enough examples of even mounted archers and crossbowmen in western armies that it would not be unreasonable to mount them. Players can easily assign them to infantry or archer groups and dismount them if desired. Therefor I would suggest the simplest thing to do would be to equip all sergeants with a decent mount, and equip them as far as possible to fight on horseback, without compromising their primary role. For example, giving Sergeant Crossbowmen a Light Crossbow, high quality bolts, a decent shield and a sword would make them quite capable. Spearmen might have their spear replaced with a lance. Billmen might also be equipped with a mace of some kind, I don't know ^^
In regards to the knightly branch, perhaps it will be necessary to invent some degrees of knighthood. A few levels of squire perhaps, or maybe levels of Knight. It might go, Squire, Knight-Errant, Knight Bachelor, Knight Banneret...