Other
American Merchant Marine at War: u.s. Merchant Marine in World War Ii
Gives an excellent history of the sailing ships and sailors of the Merchant Marine in both the Atlantic and Pacific. Links on the page include many firsthand accounts of the sailors and their experiences during the war.
Curated OER
History Matters: The Zimmerman Telegram Bringing America Closer to War
This is a copy of the actual Zimmerman Telegram where Germany states that it "Intends to begin - unrestricted submarine warfare." A great primary source that takes students deeper into historical understanding.
Digital History
Digital History: The United States Wwi
This site explains how Germany resuming unrestricted submarine warfare contributed to the US entering WWI. Site is well-written, informative, and contains great details.
Other
Canonesea, Convoy Hx72 and U 100
A detailed account of the attack on a merchant convoy traveling from Canada to England. At the time of the attack (Sept. 1940), it represented the largest U Boat "Wolf Pack" attack on a British convoy.
Other
Deep Image: The Discovery of the U767
A first hand account on the discovery of the German U Boat, the U767, which was sunk in the English Channel by British naval forces. Includes a primary source on the attack on the U Boat.
Other
Uboat.net: Imperial German Majesty's Uboats in Wwi
A Brief article describing the U-boat crisis of 1916 and the declaration of unrestricted submarine warfare
Mariners' Museum and Park
Mariners' Museum: Battle of the Atlantic: A Virtual Exhibit
An online exhibit detailing Word War II's Battle of the Atlantic.