U-boat War in World War One

The U-boat proved its worth as a serious fighting machine right at the beginning of WWI when Kptlt. Otto Weddigen in his small U-9 sank 3 British cruisers in less than hour on 22 Sep 1914. From then on the U-boats, although never committed fully until well into 1917, caused the Allies very serious problems and scored incredible victories while suffering their own losses as well.

All U-boats

375 U-boats commissioned before the end of the war.

U-boat fates

Read about U-boats losses, surrendered or interned boats etc.

The Officers

Read about some of the more famous officers during the war. See the complete listing of commanders or view the most successful officers.

All U-boat commanders

Now you can see the entire listing of WWI U-boat commanders.

U-boat types

Type UB II

41 types of 6 main classes of boats became operational. See all U-boat types of WWI.

Shipyards and builders

10 shipyards built 375 U-boats that were ready during WWI.

Ships hit by U-boats

The Danish Steamer Gerda. She was hit by U 46 on 16 Dec 1916.

View our ships attacked database of over 7,400 ships in 7,600 incidents.


His Imperial Majesty's U-boats in WWI

The U-Boat Bases Of Brugge, Zeebrugge And Oostende

The Flandern U-boat bases and U-Bootflottille Flandern


A simple page listing the main sources and contributors of this section.