German U-boats.
U-Boats
In World War I, the Germans used submarines mainly to create a Submarine Blockade on Britain in an attempt to starve Britain out of the war. This blockade is similar to the Naval Blockade Britain used on Germany, but was not as effective, and Germany stopped halfway through the war. However, towards the end of the war when Germany was losing, they restarted the 'unrestricted submarine blockade', which accidentally sunk an American passenger ship. This angered America, leading to America's participation in the war, and the ultimate defeat of Germany.
Submarines.
The U-Boat which is short for Unterseeboot. They were particularly effective in enforcing the trading blockade by performing commerce raids on enemy shipments.
World War 2
The First World War - 2003 Blockade 1-7 was released on: USA: 2003
World War II
Plural of Unterseeboot, German for Submarine. U Boat. They were widely used in World War I in an attempt to blockade Britain.
naval blockade
TO blockade southern ports
The North Sea
Germany blockaded Britain in ww1 because her people were starving and suffering. Germany did this after Britain had already blockaded Germany to try and win the war.