Slice wild game into 1/4-inch slices. Place meat slices in bowl with milk for 1/2 hour. (Milk must cover the meat.)
Combine flour, baking mix, salt and pepper in a shallow dish. Slice onion into rings. Remove game slices from milk and coat with flour mixture. In hot fry pan add butter, and quickly sear the wild game. Do not overcook.
Layer bottom of crock pot with wild game, then a layer of onions and finally a serving spoon full of mushroom soup. Continue layering in this fashion until crock pot is full. Lastly, pour red wine over the top. Cook in crock pot on low 8 hours.
Servings: 6