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The Cunard liner Lusitania, one of only 14 four-stackers ever built steaming into New York harbor. (Photo by Keystone/Getty Images) ( 98f/51/kosp/13029/1x10 )

June 1912: Passengers on the promenade deck of the RMS Lusitania. (Photo by Topical Press Agency/Getty Images) ( 99s/19/huty/13440/12 )

LUSITANIA - bow and portside, out in harbor. Bain News Service. Library of Congress

circa 1909: The dining room aboard the British SS 'Lusitania.' (Photo by Hulton Archive/Getty Images) ( steve20/hulton/edw/12/4 )

circa 1910: British liner the 'Lusitania', which was sunk off Kinsale on the Irish coast by a German U-boat in 1915. (Photo by Hulton Archive/Getty Images) ( 95c23/huch/1014/59 )

Saloon passengers enjoy a game of shuffleboard on the deck of the Cunard liner Lusitania. Circa 1912. (Photo by Topical Press Agency/Getty Images) ( 98f/51/kosp/13030/1x27a )

American theatrical producer Charles Frohman (1860 - 1915) in 1914, a year before he died on the Lusitania. (Photo by Daniel Frohman/Hulton Archive/Getty Images) ( J46296409 )

LUSITANIA, 1907-1914, New York City: tug easing ship into pier, 6 March 1914. Library of Congress

Children playing with a skipping rope on the 2nd saloon deck of the Cunard liner RMS Lusitania. Circa 1912. (Photo by Topical Press Agency/Getty Images) ( 98f/51/kosp/13029/1x27d )

June 1912: Passengers on the second class deck of the RMS Lusitania. (Photo by Topical Press Agency/Getty Images) ( 99s/19/huty/13440/14 )

circa 1910: The magnificent lounge of the Cunard steamship Lusitania. (Photo by Hulton Archive/Getty Images) ( 98n/20/huty/12385/35 )

14th September 1909: The Cunard liner the 'Lusitania' arrives at Fishguard. (Photo by Topical Press Agency/Getty Images) ( steve20/hulton/edw/12/6 )

Passengers relax in deck chairs on the saloon deck of the Cunard liner Lusitania, June 1912. The ship was sunk by a German submarine in 1915. (Photo by Topical Press Agency/Hulton Archive/Getty Images) ( J105866401 )

Three children playing deck quoits on board the Cunard liner Lusitania, June 1912. (Photo by Topical Press Agency/Hulton Archive/Getty Images) ( J105866402 )

A view on the deck of the Cunard liner Lusitania, circa 1915. Original Publication: The Graphic, pub. 15th May 1915. (Photo by The Graphic/Hulton Archive/Getty Images) ( J105866403 )

RMS Lusitania, New York City, September 1907, stern-side view, during maiden voyage, with a large crowd of men, in foreground, standing on top of barrels. Library of Congress

4th September 1909: The dining car of the Lusitania's boat train, at Fishguard. (Photo by Topical Press Agency/Getty Images) ( rachel21/hdc/edw/25/4 )

circa 1914: The British steamship, 'Lusitania' . (Photo by Topical Press Agency/Getty Images) ( 97l/31/huty/7715/05 )

December 1911: Passengers on board British Cunard liner Lusitania. (Photo by Topical Press Agency/Getty Images) ( 97f/13/huty/6706/192 )

LUSITANIA arriving in N.Y. for first time, Sept. 13, 1907: starboard view; crowd at dock; people waving from ship. Johnston, Frances Benjamin, 1864-1952, photographer. Library of Congress

June 1st , 1912: Rough seas seen from the deck of the Cunard liner 'Lusitania'. (Photo by Topical Press Agency/Getty Images) ( rachel18/hdc/1900-19/10/107 )

Passengers relax in deck chairs on the saloon deck of the Cunard liner Lusitania, June 1912. (Photo by Topical Press Agency/Hulton Archive/Getty Images) ( J105866404 )

May 7th, 1915: The sinking of the Cunard ocean liner 'Lusitania' by a German submarine off the Old Head of Kinsale, Ireland. (Photo by Hulton Archive/Getty Images) ( 97d/04/huch/6082/03 )

May, 7th 1915: Illustration of the sinking of the Cunard ocean liner 'Lusitania' by a German submarine off the Old Head of Kinsale, Ireland. (Photo by Three Lions/Getty Images) ( 02x/11/diry/15241/09f )

May 7th 1915: The British passenger liner 'Lusitania' sinking off the southern coast of Ireland after a German torpedo attack, with the loss of 1,198 lives on the 7th May. The drawing uses material supplied by survivors. Original Publication: The Graphic - A Crime That Has Staggered Humanity: The Torpedoing Of The Lusitania - pub. 15th March 1915 Original Artwork: Drawn by Charles Dixon (Photo by Hulton Archive/Getty Images) ( 97r/34/huty/7838/10 )

May 8th 1915: Front page of the New York Herald newspaper carrying the news of the sinking of the British liner the 'Lusitania' by a German submarine on the 7th May 1915. (Photo by Hulton Archive/Getty Images) ( steve21/hdc/edw/17/6 )

October 1, 1915: Leslie Martin and Joseph Parry of the 'Lusitania' with their medals for bravery. They were decorated by the King. (Photo by Topical Press Agency/Getty Images) ( 99l/03/huty/13115/01 )

May 1915: A crowd of British sailors join the funeral procession in Eire for the victims of the sunken Lusitania. (Photo by Topical Press Agency/Getty Images) ( 98l/33/huty/12691/14 )

May 1915: Survivors of the Lusitania disaster. (Photo by Topical Press Agency/Getty Images) ( 98t/33/huty/12693/06 )

May 1915: The funeral procession of several victims of the Lusitania disaster. (Photo by Topical Press Agency/Getty Images) ( 01x/41/diry/15181/18f )

May 15, 1915: Captain William Turner (1856 - 1933), commander of he British passenger liner Lusitania, which had been sunk a week earlier by a German submarine with the loss of 1,198 lives. (Photo by Hulton Archive/Getty Images) ( 02x/15/diry/15250/35u )

May 1915: Survivors from the 'Lusitania', which was hit by a U-boat torpedo, standing outside the town hall in Cobh, County Cork. (Photo by Topical Press Agency/Getty Images) ( dave13/first/fww/sea/00706 )

May 1915: The coffins of victims of the Lusitania disaster outside the offices of the Cunard Company. (Photo by Topical Press Agency/Getty Images) ( 97i/10/huty/6639/16 )

May 1915: A survivor of the Cunard passenger liner, the Lusitania, that was sunk by a German U-boat off the South Coast of Ireland near Kinsale. (Photo by Topical Press Agency/Getty Images) ( 97f/37/irnd/8155/29 )

May 1915: In an old churchyard in Queenstown, Ireland soldiers dig graves for the victims of the Lusitania disaster. (Photo by Topical Press Agency/Getty Images) ( 97m/42/huty/9091/01 )

May 1915: A graveside service for the victims of the Lusitania disaster. (Photo by Topical Press Agency/Getty Images) ( 97r/34/huty/7838/05 )

May 1915: Funeral cortege in Queenstown of the victims of the Lusitania disaster. (Photo by Topical Press Agency/Getty Images) ( 97m/42/huty/9091/02 )

Servicemen attend the mass funeral in Cobh, County Cork of the victims of the Lusitania disaster. (Photo by Topical Press Agency/Getty Images) ( 98f/51/kosp/13029/1x11c )

German submarine U20, on Danish coast, said to be the one that sank the LUSITANIA between 1914 and 1919. Library of Congress

Remember the "Lusitania." It is your duty to take up the sword of justice to avenge this devil's work. Enlist to-day / printed by A. White & Co., 6 Hill Street, Finsbury, London, E.C. Parliamentary Recruiting Committee. Library of Congress