The correct answer to this open question is the following.
If this open question is referring to World War 1, then the setting blockades set the stage for fighting at sea as well as on land because that was the option left for countries in cases such as the British blockade from 1914 to 1919. The goal of this decision by the British government was to block or impede Germany to get supplies. Germany needed the supplies to support its troops in the war front. So countries fought by land and sea. Allies benefited from the help of the United States when it entered the war on April 6, 1917, but the blockade represented a big factor to force Germany to surrender.
