Unrestricted submarine warfare · Glossary

Warfare

A policy of sinking merchant ships without warning inside a declared zone. Germany announced it in February 1915, suspended it after the Lusitania and Sussex sinkings, and resumed it on 1 February 1917, which helped to bring the United States into the war.

Mentioned in

Chapter V The Year of Attrition §6 Jutland: The Day of the Dreadnoughts
Chapter VI The Year of Revolutions Overview §1 Germany's Gamble: The U-boats and the Zimmermann Telegram §2 America Enters, and the World Follows
Chapter XI War on Waves and Wings Overview
Chapter XII The Home Fronts §4 Food, Rationing and Hunger
Chapter XIII A World on Fire Overview §7 The Americas: Neutrality, Telegram and Entry