Some errors there...
"The terms sergeant should not be confused with sergeant-at-arms, a rank originally implying membership of a royal bodyguard, formed by Philip Augustus of France for the Third Crusade. Similar bodyguards were soon adopted by other European monarchs and, because of their proximity to the king in battle, they were frequently used to carry orders, or see that orders were being carried out. They were armed with a mace bearing the royal arms and this weapon came to be recognised as a symbol of royal authority." - Terence Wise, Medieval Warfare (1976), Osprey Publishing pp 4.
The French term was
sergent du Roy, royal sergeant, and not sergeant-at-arms. Maces with
fleur de lys engraved at the tip only made an appearance more than two centuries later, as ceremonial maces used as badges of office rather than as weapons.
Spong 说:
"...the Cavalry consisted therefore of knights, sergeants and men-at-arms and it is as well at this point to define precisely what these terms mean. The nobles and knights were of various ranks, by which they may be positively identified: barons, earls, dukes and princes of the peerage; and knights bannaret, knights bachelor and simple knights. These men were the officers of the army, with the household knights and the poorer knights, who lacked a retinue, fighting in the ranks. They and their horses were heavily armoured. The sergeants were all those below the rank of a knight who had the equipment of a knight, or a lighter form of it. Their horses were smaller than those of the knights and were unarmoured. The term man-at-arms actually applies to all mounted fighting men who wore armour, but although a knight might therefore be called a man-at-arms, a man-at-arms was not necessarily a knight, being possibly a sergeant or squire. Thus the sergeants and squires, who normally fought in the ranks behind the first rank of knights and peers, formed the bulk - the rank and file - of the cavalry." - Terence Wise, Medieval Warfare (1976), Osprey Publishing pp 20-21.*
The distinction between between knights bachelor and 'simple knights' appears to have been invented by Terence Wise, unless it reflects some idisyncracy of England I've never yet come upon; certainly in the customs of France, of Hainaut, of the Lorraine, etc, there were only two ranks of knightood, the banneret who could march to war under his own banner, and the bachelor, who could not. The term "bachelor" itself is normally considered to have derived from
bas chevalier, litterally "lower knight", although Loyseau emitted a dissenting opinion, deriving the term from
bas eschelon, "lower echelon" or, if you prefer, "lower rank". Given the use of the term bachelor as an adjective, Loyseau's opinion carries some weight; but the frequency with which it is found as a substantive would be consistent with the more common etymology. Perhaps two roginally different terms evolved into the same word?
Beside that, he seems to brutally divide everything into nice little categories. The idea that you could consistently identify a man's equipment and battlefield role according to his rank or ttile is absurd; at Comines in 1382 you have a knight serving as a
spy. Similarly his reserving of the term sergeant for those who foguth as men-at-arms is blatantly ignoring all the sergeants in communal militias, not to mention all the sergeants one would find off a battlefield...
But hey, that'ss Osprey for you. Nice pictures, but not necessarily good research.