I take the opportunity to fix the reasons for the decision, which u-boat hit which steamer.

U 46 and U 47 attacked at the same time from the same side; U-47 attacking from a position further northward (grid 03), U 46 from a position further southward (grid 63). Both U-boats stated their torpedoes running 1500 meters before the first detonation was heard. That makes probable that U-47 really hit "Wandby" in column 1. U-46 heard the detonation and claimed his first hit. U-46's second torpedo hit "Ruperra", steaming south of "Wandby" in column 6.

Best regards
Thomas