You could use the idea I was going to do ages ago, but never got around to it. ;D
Its a winter mission, set on the East Boarder map.
The intro shows a Fokker Troopship being flown over Russian territory to reinforce the Finnish forces holding the line there. Inside are 24 Sissi Soldiera. But the plane is shot down.
The mission begins as you as one of the Sissi onboard the plane. You start by the wreck with 10 other surviing Sissi members, and a pilot. The pilot knows vital information about the flightplan, and something else that no-one on your team knows about. He is forbidden to tell you, so it is vital that he gets back to base alive.
Anyway, you're the leader of this squad, with a variety of weapons from the wreck.
You must go cross the map to the HQ. Simple, huh?
Well, no. Most of the way will be behind enemy lines, and there will be lots of patrols, convoys and garrisons in every town.
Depending on the difficalty, the player may or may not have a map. He will either have to:
a) find one in a town/base
b) Steal one off an enemy officer
c) go without (but this will be very hard)
So it will be one of those missions where you mine every road you cross because theres bound to be a convoy use it later, or destroy bridges behind you as this will disrupt patrols, making it easier to escape.
I was going to make there be so many enemy, that by the end, you should have manually rearmed the majority of your squad, many with captured enemy weapons.
Thats it I think. Feel free to use the idea if you want