To be fair, that is not in and by itself a sign of desperation. One of the fundamental roles of kingship is that of a Warleader and with limited command and control available once battle is joined, sticking in alongside his retinue, in itself usually some of the best equipped and skilled troops available is hardly a bad idea. In warhammer cnc options may be expanded via magic or flying mounts, but by the same token individual hero fighters are much more capable than they are IRL, so in the end those considerations kinda cancel each other.