Why was the submarines important to the ww1?

Submarines played a crucial role in World War I, particularly through the use of unrestricted submarine warfare by Germany. This strategy targeted not only military vessels but also merchant ships, aiming to disrupt supply lines to the Allies. The sinking of ships like the Lusitania galvanized public opinion against Germany, contributing to the United States' entry into the war. Additionally, submarines introduced a new dimension of naval warfare, emphasizing stealth and surprise in maritime engagements.