WWI The First Modern War: The Germans Engage In Unrestricted Submarine Warfare | History

History Snapshot: Jan 31 1917, Germany began unrestricted submarine warfare

How Germany Revolutionized Submarine Warfare

How German Submarines Were Used During The War

Unrestricted Submarine Warfare

7th May 1915: RMS Lusitania sunk by the German U-Boat, U-20

18.World War I.The victory of German submarines led to the involvement of the United States.

How A Single Submarine Started WWI (For the US)

Henning Von Holtzendorff & Unrestricted Submarine Warfare

WWI: US declares war on Germany

The History Of Submarine Warfare

Why Did the U.S. Join World War 1?

19.World War I.The US Joins the Entente Powers in WWI: A Historical Overview

UNRESTRICTED SUBMARINE WARFARE ~ HOI IV Man The Guns ep14

THE HISTORY OF THE GERMAN NAVY; 1914 - 1945 (English language)

How the Sinking of Lusitania Changed World War 1?

Unrestricted Submarine Warfare – Rule the Waves – Russia Part 13

Submarines: From Raider to Wolfpack | Documentary | Ep. 01

History Briefs: The Zimmermann Telegram: Why America entered the First World War

How Did The Allies Wage War Against Nazi Germany's U-Boats? | Battlefield | War Stories