Hello, I’m looking for a romance novel where the female lead created sleds and rushed food supplies to somewhere (I think it was to support an army that was attacking a city). I believe this was a romance and the general in charge of the attack was the male lead(?) It was winter and the army was in a desperate situation. They were either running out of supplies or lost them for some reason. News got back to the female lead and that’s when she came up with the blueprints for a sled to rush over the supplies just in time.