Prepare 4 green peppers for stuffing. Soak 2 slices of white bread (trim crust) in 1/3 cup milk and mash until smooth. Flake 1 can of undrained tuna fish, mix with bread. Add 6 chopped olives and 1/4 teaspoon salt to fish mixture. Stuff peppers and arrange in upright position in well greased casserole. Cover and bake for 1 hour in a 350 degree oven.