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| | German, U-boat, U-39, U39, U.39, Courageous, Ark Royal Fortune, Forester, Foxhound, Firedrake, HMS |
 | | In Norway, troops landed at Oslo, Kristiansand and Bergen in the south, Trondheim in the centre and Narvik in the north. |
 | | German Navy forces included a pocket battleship, six cruisers and 14 destroyers for landings at the five Norwegian ports, with battlecruisers Scharnhorst and Gneisenau covering the two most northerly landings. |
 | | German Codes - 'Ultra' was now breaking the Luftwaffe Enigma codes with some regularity, and early in the month had its first major breakthrough when supporting evidence for the Knickebein navigation aid for bombers was obtained. |
| www.naval-history.net /WW2CampaignsUboats.htm (4036 words) |
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