They needed to sink more supplies; and wisely so.
War was nearing it's end (exhaustion), needed to slow those supplies down abit more!
In early 1917, tensions between the US and Germany escalated primarily due to Germany's unrestricted submarine warfare, which threatened American shipping and lives. The sinking of ships like the Lusitania in 1915 had already heightened public sentiment against Germany, but the resumption of such tactics in early 1917 provoked outrage in the US. Additionally, the interception of the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the US, further inflamed relations and pushed America closer to entering World War I.
On January 31, 1917, Germany notified the United States that there would be a resumption of unrestricted submarine attacks. They announced that they would sink on sight all merchant ships found in a zone around the British Isles or in the Mediterranean Sea. US President Woodrow Wilson then cut off diplomatic relations between the US and Germany.
In 1916, the sinking of the Lusitania and other attacks by German U-boats heightened anti-German sentiment in the U.S., setting the stage for increased public outrage. Additionally, the resumption of unrestricted submarine warfare by Germany in early 1917 further escalated tensions. The Zimmerman telegram, which proposed a military alliance between Germany and Mexico against the U.S., was intercepted in early 1917, amplifying fears of German aggression and swaying public opinion towards supporting entry into World War I. Together, these events created a climate of heightened alarm and nationalism, making the telegram's revelation particularly impactful.
The Villain - 1917 was released on: USA: 15 July 1917 West Germany: August 1967 Germany: 6 April 1997 (TV premiere)
Russia
In 1917.
Final ground offensives were in the making. Armies needed to ensure that the allies didn't get the necessary equipment/supplies, thus giving the German armies all the help they could get.
No they won against Germany in 1918.
1917
U.s.
The Iced Bullet - 1917 was released on: USA: 21 January 1917 Germany: June 1924