In World War I, Germany deployed U-boats in an attempt to stifle the flow of essential supplies to Britain and other Allied nations, without success.
World War I. Torpedoing of the Lusitania. The RMS Lusitania was
What Sunk the Lusitania? If you Think it was a Torpedo, Think
How the Sinking of Lusitania Changed World War I
Sinking Of The RMS Lusitania: A Wreck You Can Visit Today
Sectional drawing of the 'Lusitania' showing the German U-boat
Fateful Voyage of the Lusitania
Falvey Library Exhibits :: The Complex Case of the RMS Lusitania
The Lusitania, The Great War
Blockades, u-boats and sinking of the Lusitania