Operation Drumbeat (January - June 1942)

One of the remainder was under repair, leaving only five boats for Operation Drumbeat (Paukenschlag).

Operation Drumbeat had one other effect.

The period of this campaign, called Operation Drumbeat, was the second 'happy time' for the German submariners.

Her fourth patrol, as part of Operation Drumbeat, saw the submarine enter the Gulf of Mexico.

The onslaught began with Operation Drumbeat when 35 Allied ships were sunk by U-boats off the American coast in January 1942.

U-123 took part in the opening of Operation Drumbeat, also called the "Second Happy Time" or Paukenschlag in January 1942.

For the five Type IX boats in the first wave of Operation Drumbeat, it was a bonanza.

The boat was also successful in early 1942 as part of Operation Drumbeat (Paukenschlag), the German assault on merchant shipping along the US coast.

U-66 was one of the boats that participated in the first wave of attacks in "Operation Drumbeat".