The Battle of the Atlantic lasted as long as World War Two itself. By the summer of 1942 one Allied ship was going down every four hours, yet German U-boat losses remained frustratingly low.

The flags of war like storm-birds fly, The charging trumpets blow; Yet rolls no thunder in the sky ... and greenness sweeps The battle's breath of hell.

and to learn "a little bit more about the Battle of the Atlantic." It was the longest continuous military campaign of WW II and was fought for the control of vital supply routes, beginning as war ...