History Thread for “submarine”

01

August 6, 2026 Breaking

Pacific ministers split over China

Foreign ministers and senior officials from Pacific Islands Forum countries failed to reach agreement on August 6, 2026, on a joint statement responding to China's recent ballistic missil...

america australia ballistic beijing china competition

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R1

Published Research World Wars: Power, Conflict & Consequence

U-Boats Attack Britain's Atlantic Lifeline

1 February 1917–11 November 1918 — German submarines attack merchant shipping in an attempt to reduce British imports below sustainable levels. Early shipping losses are extremely serious...

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R2

Published Research World Wars: Power, Conflict & Consequence

Berlin Gambles That Britain Can Be Defeated Before America Matters

December 1916–January 1917 — German naval and military leaders conclude that unrestricted submarine warfare may force Britain out of the war. They understand that the policy may provoke A...

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R3

Published Research World Wars: Power, Conflict & Consequence

Untitled

Untitled1914–1918 — Industrial warfare requires food, coal, metals, chemicals, credit and shipping on unprecedented scales. Britain attempts to deny overseas resources to Germany through ...

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R4

Published Research World Wars: Power, Conflict & Consequence

American Submarines Strangle Japanese Shipping

1 January 1944 — By 1944 American submarines are destroying Japanese merchant shipping at a rate Japan cannot replace. Oil, food, raw materials and military supplies become increasingly d...

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R5

Published Research World Wars: Power, Conflict & Consequence

Battle of Jutland

31 May 1916 — Britain's Grand Fleet and Germany's High Seas Fleet clash in the North Sea in the largest naval battle of the war. Germany inflicts heavier tactical losses, but Britain reta...

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R6

Published Research World Wars: Power, Conflict & Consequence

Germany Resumes Unrestricted Submarine Warfare

1 February 1917 — Germany begins unrestricted submarine attacks against shipping approaching Allied-controlled waters. German naval leaders believe U-boats can reduce British imports enou...

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R7

Published Research World Wars: Power, Conflict & Consequence

Henning von Holtzendorff

1915–1918 naval leadership — Admiral Henning von Holtzendorff is a powerful advocate for unrestricted submarine warfare. In late 1916 he argues that U-boats can reduce British shipping su...

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R8

Published Research World Wars: Power, Conflict & Consequence

Lusitania Is Sunk

7 May 1915 — German submarine U-20 torpedoes RMS Lusitania off the coast of Ireland. Nearly 1,200 people are killed, including more than one hundred Americans. The sinking produces intern...

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R9

Published Research World Wars: Power, Conflict & Consequence

United States Enters the War

6 April 1917 — The United States declares war on Germany. Unrestricted submarine warfare is the immediate strategic cause, while the Zimmermann Telegram further intensifies anti-German op...

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R10

Published Research World Wars: Power, Conflict & Consequence

Why Did the United States Enter?

1914–6 April 1917 — American trade and finance become increasingly connected with the Allied economies, but German submarine warfare repeatedly challenges American maritime policy. The Zi...

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R11

Published Research World Wars: Power, Conflict & Consequence

Woodrow Wilson

1913–1921 presidency — Wilson initially attempts to maintain American neutrality while defending neutral commercial and maritime rights. German unrestricted submarine warfare and the broa...

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R12

Published Research World Wars: Power, Conflict & Consequence

Woodrow Wilson

1913–1921 presidency — Wilson initially attempts to maintain American neutrality while defending neutral commercial and maritime rights. German unrestricted submarine warfare and the broa...

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