Figured you guys would get a kick out of this, an arctic convoy ship upon finding its supply of ammunition inadequate;
"It was decided on 28 June to open the seals on one of the three M-3 U.S. Army tanks on the deck, part of the cargo, and to determine whether the 37 millimeter gun in it could be manned and used for the defense of the ship. This was thought advisable in view (1) of the small ammount of mixed tracer and ball .30 ammunition in our lockers; and (2) of the short effective range of the .30 Lewis machine gun against aircraft. This done, the gun was found suitable for use. Ammunition (Armor Piercing with tracer) was broken out of the hold with the aid of the Chief Officer, the gun was test-fired and a two man crew trained and assigned General Quarters stations in the tank.
Next day a second tank was opened, the 37 mm. gun made ready and manned. One member of the Armed Guard and one of the ship’s crew were used as crew for each of the tank guns."
Is this from Sixth Army? I've seen reference to communiques; “According to intelligence reports, very strong panzer concentrations of US origin have entered the Stalingrad sector." but never managed to find them.