Germany’s use of submarines to attack British and French passenger ships and freighters led to the sinking of an unarmed French boat, the ''Sussex'', in March 1916. Wilson threatened to sever diplomatic relations with Germany unless the German Government refrained from attacking all passenger ships, and allowed the crews of enemy merchant vessels to escape into lifeboats. On May 4, 1916, the German Government accepted these terms and conditions in what came to be known as the “Sussex pledge.” | Germany’s use of submarines to attack British and French passenger ships and freighters led to the sinking of an unarmed French boat, the ''Sussex'', in March 1916. Wilson threatened to sever diplomatic relations with Germany unless the German Government refrained from attacking all passenger ships, and allowed the crews of enemy merchant vessels to escape into lifeboats. On May 4, 1916, the German Government accepted these terms and conditions in what came to be known as the “Sussex pledge.” |