TheMP and LNAGary both make good points about the inherent abstractness of CCN. Of course, it's a game that has to be taken with a big grain of salt.
But perhaps to explain my point better, my problem with Short Supply is less about content, and more about form. As a card, it doesn't seem to fit with the general flow of the game. A unit of any type or quality, which may or may not have battled, and which may or may not have inflicted casualties on the enemy, *poofs* an unlimited number of hexes to the rear. Even within the abstracted context of CCN, that seems like an outlier. It just doesn't seem to fit.
EDIT: Thus, the goal of my suggested house rule would be to maintain the spirit of Short Supply, while making the experience a bit more believable and flow better with the rest of the game.
Even cards like La Grande Manoeuvre have a set number of hexes, and can be readily explained in Napoleonic terms (the troops are in movement columns, at the double quick, etc).
Mark also makes a good point about penalizing the player who drew Short Supply. Perhaps the above suggested house rule should also allow for the drawing player to, after the effects of the short supply card are carried out, draw a replacement tactician card.
A fellow I game with a lot prefers to play with the original card deck. In that case especially, it would be crucial that the player who draws Short Supply is able to replenish their hand at the end of their turn.
"Rogues, would you live forever?"
"If my soldiers were to begin to think, not one would remain in the ranks." ~Friedrich II