11:52 Second Happy Time: U-boats Terrorise the US Coast: Operation Drumbeat 5:59 Operation Drumbeat: WWII German Subs Sink American Shipping - TheBlazeTV - REAL HISTORY - 2012.02.17 1:07 Remembering 'Operation Drumbeat' U-boat offensive 81 years ago 2:52 Operation Drumbeat 0:22 The ordering of Operation Drumbeat 1:33 operation drumbeat 0:55 1942 Nazi U-Boats Reach New York!!!