Congratulations on publishing your Jam prototype!
I found the card mechanics self-explanatory, although some people might be confused or frustrated by it. The mouseover tooltips are good.
One decision I found somewhat questionable was that you include “Change Units” for reallocating the soldiers after you’ve seen who your opponents will be, although you don’t have anything equivalent for the card selection; the player simply goes through with whatever is dealt and deals with the loss if it happens. One idea for improving this situation could be some cost to redraw after viewing the territory, if you have cash leftover after troop selection.