Okay, lets say that the plane that spotted Bismarck has a mysterious malfunction and falls into the ocean and never gets a glimpse of Bismarck. Lets also say that the Bismarck manages to link up with 1 or maybe 2 of the Pocket Battleships and some U-Boats get told to meet up with them. By OP fiat they manage to keep it up for a possible 3 months or until they need resupply. Once they need resupply, they make it to a French port and head back out. How much damage could they collectively inflict on shipping and what British forces would be sent after them? Lets say that two months after Bismarck goes, Tirpitz sails forth as well with a handful a ships such what few Destroyers and Battlecruiser etc remain and manage to link up with some U-Boats as well. Same mercy rule. If Bismarck and co manage to survive, would they team up with Tirpitz or would both stay apart trying to maximise coverage of the Eastern half of the Atlantic? 2nd Scenario: Just for lulz, what if Yamato and Musashi join them with Soryu and a few subs armed with Long Lances in trying to lock down the Atlantic and the US didnt enter the war and was content to attempt to trade with all powers until the last possible moment, ala WWI, if at all. Yes, OP Fiat means that they get to go through Panama and restock on fuel from America. Possibly the Japanese havent yet made clear their intentions... Wow, what would British and German reactions be if they thought the Japanese were coming to the rescue but turned out to be on Nazi Germanies side?