Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with concealed weaponry, designed to lure submarines into making surface attacks. This gave Q-ships the chance to open fire and sink them. The use of Q-ships contributed to the abandonment of cruiser rules restricting attacks on unarmed merchant ships and to the shift to unrestricted submarine warfare in the 20th century.
USS Jacob Jones was a Tucker-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the first U.S. Navy vessel named in honor of Jacob Jones.
USS Benham was an Aylwin-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the first U.S. Navy vessel named in honor of Rear Admiral Andrew E. K. Benham.
The first USS Cassin (DD-43) was the lead ship of Cassin-class destroyers in the United States Navy during World War I. She was later transferred to the United States Coast Guard, where she was designated CG-1. She was named for Stephen Cassin.
USS Balch was an Aylwin-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the first U.S. Navy vessel named in honor of George Beale Balch, a US Navy officer who served in the Mexican–American War and the American Civil War, and as Superintendent of the United States Naval Academy.
The O'Brien class of destroyers was a class of six ships designed by and built for the United States Navy shortly before the United States entered World War I. The O'Brien class was the third of five classes of destroyers that were known as the "thousand tonners", because they were the first U.S. destroyers over 1,000 long tons (1,016 t) displacement.
USS O'Brien was the lead ship of O'Brien-class destroyers built for the United States Navy prior to the American entry into World War I. The ship was the second US Navy vessel named in honor of Jeremiah O'Brien and his five brothers Gideon, John, William, Dennis, and Joseph who, together on the sloop Unity, captured a British warship during the American Revolutionary War.
USS Winslow was an O'Brien-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the second US Navy vessel named in honor of John Ancrum Winslow, a US Navy officer notable for sinking the Confederate commerce raider CSS Alabama during the American Civil War.
USS Ericsson was an O'Brien-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the second U.S. Navy vessel named in honor of John Ericsson, the Swedish-born builder of the ironclad warship USS Monitor during the American Civil War.
The Tucker class of destroyers was a ship class of six ships designed by and built for the United States Navy shortly before the United States entered World War I. The Tucker class was the fourth of five classes of destroyers that were known as the "thousand tonners", because they were the first U.S. destroyers over 1,000 long tons (1,016 t) displacement.
USS Porter was a Tucker-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the second U.S. Navy vessel named in honor of both David Porter and his son David Dixon Porter.
USS Wainwright was a Tucker-class destroyer built for the United States Navy prior to the American entry into World War I. The ship was the first U.S. Navy vessel named in honor of U.S. Navy officers Jonathan Wainwright, his cousin, Commander Richard Wainwright, and his son, Jonathan Wainwright, Jr..
Osmond Kelly Ingram was a sailor in the United States Navy during World War I who received the Medal of Honor posthumously.
Ronald Niel Stuart, VC, DSO, RD, RNR was a British Merchant Navy commodore and Royal Navy captain who was highly commended following extensive and distinguished service at sea over a period of more than thirty-five years. During World War I he was awarded the Victoria Cross, the Distinguished Service Order, the French Croix de Guerre avec Palmes and the United States' Navy Cross for a series of daring operations he conducted while serving in the Royal Navy against the German U-boat campaign in the Atlantic.
HMS Snowdrop was an Azalea-class sloop of the Royal Navy. She served during the First World War. Snowdrop survived the war and was sold for scrap in 1923.
The action of 17 November 1917 was a naval battle of the First World War. The action was fought between a German U-boat and two United States Navy destroyers in the North Atlantic Ocean.
HMS Pargust was a Royal Navy warship that was active during World War I. She was a Special Service Vessel used by the RN in anti-submarine warfare. Pargust was active in this role during the last two years of the war, and was successful on one occasion, destroying the U-boat UC-29.
United States Navy operations during World War I began on April 6, 1917, after the formal declaration of war on the German Empire. The American navy focused on countering enemy U-boats in the Atlantic Ocean and the Mediterranean Sea while convoying men and supplies to France and Italy. Because of United States's late entry into the war, her capital ships never engaged the German fleet and few decisive submarine actions occurred.
HMS Aubrietia was one of 12 Aubrietia-class sloops completed for the Royal Navy and was launched in 1916. During World War I, she functioned as a Q-Ship and served under the name Q.13, also taking the names Kai, Winton and Zebal. Aubrietia was part of the 1st Sloop flotilla, based in Queenstown and subsequently, the 3rd Sloop Flotilla in the North Sea.
HMS Zinnia was an Azalea-class minesweeping sloop of the Royal Navy, built in 1915 at the Swan Hunter & Wigham Richardson yard, at Wallsend in the United Kingdom.It was sold to Belgium on 19 April 1920 to join their new Corps of Destroyers and Sailors.
United States 
German Empire 
W. N. Vernou 
Victor Dieckmann 