Ok... having skimmed sources...
I disagree with your assessment of Laupen... this was an attack while still on a hill. The Swiss were able to finally defeat the mounted knights only via a flank attack... at least according to Oman's narrative.
The Sempach narrative has the men at arms dismounting.
Later Arbedo is no help either. Here 1/3 of the Swiss force was pike... and they were instrumental is stopping the German Cavalry.
Ugh...
Haarada, to answer your question... not that I can find...
The Knight victories over the Vikings of Saucourt in 881 and Chartres in 911 are well past our time period for 3Bd.
Oman speaks at length on the rise of the mounted knight being the death-knell for the Viking Age, but this seems due to operational and not just tactical considerations.
Looking further back in history may be warranted... but I am afraid the sources become more thin... and the relevance less...
Phil's other rules help little. DBMM has Bd Fast with no QK vs Knights... that is reserved for Bd(X). In DBA we have lumped them together with Bd Fast.
I fall back upon the fact that throughout history loose formation infantry has always been easily beaten by mounted. Only banding together in close formation... and then preferably with long weapons can a mounted charge be withstood. This is nicely demonstrated in DBA 3 with Solid infantry repulsing Knights on a tie and Fast infantry being stuck with them in melee... with a chance of being swept away next bound. This relationship breaks down with Bd.
Tom... Some interesting ideas with regards to missile fire. Oman makes reference to the Swiss being sensitive to missile troops... giving example with an English mercenary band that caused havoc against the Swiss cantons in the 14th century. This certainly is not well represented in DBA where 6Bd are missile troop's very worst nightmare.
What does everyone think if we cut the movement rate of 3/6 Bd down to 2BW/2BW... the same as Solid Ax? There is some precedent for this as Viking raiders and Swiss Keils were known to be operationally fast... but not necessarily tactically fast.
Joe Collins