A while back Claas posted photos showing the U-155 (Ex U-Deutschland) having retro-fitted bow torpedo tubes. I found this drawing, which illustrates the insallation. It's from Eberhard Rössler, Die Unterseeboote der Kaiserlichen Marine, 1997. The two smaller deck guns shown in the plan view are 88mm, which it seems were added in 1918 when the bow torpedo tubes were added. Bodo Herzog in Deutsche U-Boote, 1906-1966 and Erich Gröner in Die deutschen Kriegsschiffe, 1815-1945 are rather vague on U-155's armament. Never-the-less, I think Rössler is the more reliable source in this case. Dwight
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