Sort of OT; Skills question

[weswood]

At least it's not political

I have my bastardized rules system and I've been playing with converting them to a post American Civil War setting, 1865.

My skills system is more detailed than T2K, for example the skills for using swords break into Fencing- rapiers, epees & sabers, and Swords- short, long, or 2 handed.

So, would a cavalryman on horse using a saber use the Fencing skill, where the saber falls under, or Sword (long)? Fencing to me is Three Musketeers dueling type fighting where foot placement & movement and precise strikes are a major part. Swordfighting, while footwork is important, is more brute force. Or should I just add a subskill- Horseback fighting?