Save our ships!
In 1917 too many supply ships are being sunk by the Germans - Britain is in danger.
The introduction of German unrestricted submarine warfare meant the number of merchant (supply) ships being sunk rose dramatically from January 1917. Admiral Jellicoe - who was in charge of the Royal Navy - told an American representative in London.
"it is impossible for us to go on with the war if losses like this continue.... they will win if we can't stop these losses"
New tactics are introduced to try and save more ships.
The Navy introduced a convoy system to protect merchant shipping. This meant merchant ships would travel across the Atlantic in a group rather than on their own. Warships would go with them to provide protection. The convoy system had an immediate impact. German submarine losses increased and merchant shipping losses fell.