"I've seen quite a few single-hand flails labeled as a "horseman's flail." Seems to me that swinging it downward at the heads of foot soldiers from horseback, especially while riding past, would be easier and more sensible than using it on foot where you need more defensive capability from your weapon."
Makes sense, as it could be used in a manner very similar to other horseman's weapons-a strike and by the time its over the horseman is 20 or 30 yards down the pitch.
It would seem to also relate to the breaking of a line, not much evidence of flail use there, but many of the dead found at Towton seem to have been struck down while they were disorganized or trying to get away...
The problem with flails and shields is getting close enough to a shield wall with all the spears, franciscas, and etc flying about...as mentioned earlier the nature of a flail does not allow the compression of force of other weapons.
And in the latter period when full harness was in use it would still seem that a flail would be at its best advantage after unit cohesion had been broken and it was individualized fighting of scattered men...and I'd wonder if a flail used by an aristocrat might have been applied to compromise the armour enough so the other individual would fain...lots of money in chivalric hostages (at least until the English vs French campaigns of the latter 100 years war years...Henry seemed to have been instrumental in changing chivalric attitudes)
Killing foot soldiers, well in general they were 'men of no worth' and so bashing a few of them with a horseman's flail would have been considered appropriate. (plus knowing if they got hold of a aristocrat on horseback it could just as likely be a dagger up the nethers as being taken as hostage).


