It's unlikely you would have gotten a full compliment of torpedoes, even from a supply ship.
This is from an interrogation report of U-boat men in 1941:
Quote:
On the night of 8th May "Egerland" sighted a U-Boat on the surface some way off, which was stated to have been recognised as "U 107," commanded by Kapitänleutnant Hessler. .... Hessler had fired all his torpedoes and was apparently much upset that he had recently had a large merchant vessel in sight, but had been unable to attack.(...)
Although Hessler asked for a large number of torpedoes, Bahr only agrees to let him have two and, according to some prisoners, not more than one torpedo was transferred. At 0730 on 9th May, according to Rezning, "Egerland" started to refuel "U 107" and this, together with watering and re-victualling, took several hours. The amount of fuel transferred is not known. During the transfer of the torpedoes, a member of "Egerland's" crew who was in the float had his foot broken. The method of transferring torpedoes and supplies was said to have been by means of rubber floats towed to the U-Boat by "Egerland's" motor-boat. (See IV (vii).)
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