Hired Blades are the ultimate backbone of my (or any) force, at the beginning of every battle I order them to dismount and keep them on foot.
I usually have from 12-20 Vaegir Marksmen, as well as a sprinkling of crossbowmen to keep up the fire after the bowmen run out of arrows. This is handy when facing many waves of enemies, because the first wave will be completely obliterated by the Marksmen, who will then resort to their hand weapons and wait for the next wave. The crossbowmen will still have about have their bolts left, with which they will weaken the second wave, after which enemies will finally reach my men and by cut to pieces by the Hired Blades.
Cavalry are treated the same, at least 3 will be unhorsed by the archers, and one or two will be killed outright before they hit my men. I have to say this for them, Hired Blades don't budge and inch. Not even under a concentrated Khergit Lancer charge or a full force of Swadian cavalry.
I remember one battle in particular, where my 20 guys had been caught out in the open on a flat field, and 15 Swadian Men-at-Arms hit them at full speed. Not a single one broke the line, they all were stopped short just like that.