Submarine Operational Effectiveness in the 20th Century

The submarine emerged as a serious weapons system during the First World War (1914 - 1918). During that conflict Germany with its unrestricted submarine warfare campaign of 1917 nearly drove Great Britain to the negotiating table. Its U-boats sank 6,196 ships of 13,438,632 gross register tons. Despite post-war attempts to ban the submarine from warfare, it survived. Both Italy and Germany used submarines, covertly, during the Spanish Civil War (1936 - 1939). This book, Part Two of a series, discusses the use of submarines during World War Two (1939 - 1945) and their effectiveness. It focuses principally on two strategic submarine campaigns. The first is about German U-boats against British and neutral commerce. That campaign finally failed during the Battle of The Atlantic in 1943. The second deals with American submarines against Japanese shipping from Southeast Asia to the home islands, a campaign that successfully isolated Japan from its sources of raw materials and foodstuffs during 1944 and effectively defeated Japan.