On the morning of 6 December 1917, the French cargo ship SS Mont-Blanc collided with the Norwegian vessel SS Imo in the harbour of Halifax, Nova Scotia, Canada. Mont-Blanc, laden with high explosives, caught fire and exploded, devastating the Richmond district of Halifax. At least 1,782 people were killed, largely in Halifax and Dartmouth, by the blast, debris, fires, or collapsed buildings, and an estimated 9,000 others were injured. The blast was the largest human-made explosion at the time. It released the equivalent energy of roughly 2.9 kilotons of TNT (12 TJ).
SS Atlantic was a transatlantic ocean liner of the White Star Line, and second ship of the Oceanic-class. The ship operated between Liverpool, United Kingdom, and New York City, United States. During the ship's 19th voyage, on 1 April 1873, she struck rocks and sank off the coast of Nova Scotia, Canada, killing at least 535 people. It remained the deadliest civilian maritime disaster in the North Atlantic Ocean until the sinking of SS La Bourgogne on 2 July 1898 and the greatest disaster for the White Star Line prior to the sinking of the Titanic in April 1912.
Halifax Harbour is a large natural harbour on the Atlantic coast of Nova Scotia, Canada, located in the Halifax Regional Municipality. Halifax largely owes its existence to the harbour, being one of the largest and deepest ice-free natural harbours in the world. Before Confederation it was one of the most important commercial ports on the Atlantic seaboard. In 1917, it was the site of the world's largest man-made accidental explosion, when the SS Mont-Blanc blew up in the Halifax Explosion on December 6.
Rover was a privateer brig out of Liverpool, Nova Scotia, known for several bold battles in the Napoleonic Wars.
Sambro is a rural fishing community on the Chebucto Peninsula in the Halifax Regional Municipality, in Nova Scotia, Canada. It is on the Atlantic Ocean at the head of Sambro Harbour, immediately west of the entrance to Halifax Harbour. Sambro is at the end of Route 306.
HMHS Llandovery Castle, built in 1914 in Glasgow as RMS Llandovery Castle for the Union-Castle Line, was one of five Canadian hospital ships that served in the First World War. On a voyage from Halifax, Nova Scotia to Liverpool, England, the ship was torpedoed off southern Ireland on 27 June 1918. The sinking was the deadliest Canadian naval disaster of the war. 234 doctors, nurses, members of the Canadian Army Medical Corps, soldiers and seamen died in the sinking and subsequent machine-gunning of lifeboats. Twenty five people are known to have survived. 24 were the occupants on a single life-raft. The incident became infamous internationally and was considered, after the Armenian genocide, as one of the war's worst atrocities. After the war, the case of Llandovery Castle was one of six alleged German war crimes prosecuted at the Leipzig trials.
CSS Acadia is a former hydrographic surveying and oceanographic research ship of the Hydrographic Survey of Canada and its successor the Canadian Hydrographic Service.
HMS Niobe was a ship of the Diadem class of protected cruisers in the Royal Navy. She served in the Boer War and was then given to Canada as the second ship of the newly created Naval Service of Canada as HMCS Niobe. The Naval Service of Canada became the Royal Canadian Navy in August 1911. The ship was nearly lost when she went aground off Cape Sable Island, Nova Scotia overnight 30–31 July 1911. Repairs were completed at the end of 1912 and the ship returned to service in late 1914. During the First World War, Niobe patrolled the approaches to the St. Lawrence River and then joined the Royal Navy's 4th Cruiser Squadron to patrol off New York City. The cruiser returned to Halifax, Nova Scotia on 17 July 1915 and never put to sea again. Niobe was paid off in September and served as a depot ship in Halifax. Damaged in the 1917 Halifax Explosion, she was sold for scrap and broken up in the 1920s.
Sambro Island Lighthouse is a landfall lighthouse located at the entrance to Halifax Harbour, Nova Scotia, on an island near the community of Sambro in the Halifax Regional Municipality. It is the oldest surviving lighthouse in North America and its construction is a National Historic Event.
HMS Tribune was a Royal Navy 36-gun fifth rate. This frigate was originally the French Galathée-class frigateCharente Inférieure, which was launched in 1793 during the French Revolutionary Wars and renamed Tribune the next year. The British captured her and took her into service with the Royal Navy. She only served for a year before being wrecked off Herring Cove, Nova Scotia, on 16 or 23 November 1797. Of the 240 men on board, all but 12 were lost.
SSMont-Blanc was a cargo steamship that was built in Middlesbrough, England in 1899 for a French shipping company. On Thursday morning, December 6, 1917, she entered Halifax Harbour in Nova Scotia, Canada laden with a full cargo of highly volatile explosives. As she made her way through the Narrows towards Bedford Basin, she was involved in a collision with Imo, a Norwegian ship. A fire aboard the ship ignited her cargo of wet and dry 2,300 tons of picric acid, 500 tons of TNT, and 10 tons of guncotton. The resultant Halifax Explosion killed approximately 2,000 people and injured about 9,000.
SS Letitia was an ocean liner built in Scotland for service with the Anchor-Donaldson Line. She continued to serve with its successor company Donaldson Atlantic Line. At the start of the Second World War in September 1939, the British Admiralty requisitioned the ship for service and had it converted to serve as an armed merchant cruiser. She was withdrawn from this service in 1941 to become a troop ship.
The Duc d'Anville expedition was sent from France to recapture Louisbourg and take peninsular Acadia. The expedition was the largest military force ever to set sail for the New World prior to the American Revolutionary War. This effort was the fourth and final French attempt to regain the Nova Scotian capital, Annapolis Royal, during King George's War. The Expedition was also supported on land by a force from Quebec under the command of Jean-Baptiste Nicolas Roch de Ramezay. Along with recapturing Acadia from the British, d'Anville was ordered to "consign Boston to flames, ravage New England and waste the British West Indies." News of the expedition spread fear throughout New York and New England.
SS Imo was a merchant steamship that was built in 1889 to carry livestock and passengers, and converted in 1912 into a whaling factory ship. She was built as Runic, renamed Tampican in 1895, Imo in 1912 and Guvernøren in 1920.
Erg was a vessel built and owned by Halifax Steamship Ltd. in 1915. She was used to ferry workers across the harbour to vessels under repair during the Second World War. Erg was sunk in the Halifax Harbour three times and is currently located in the Bedford Basin.
SS Dufferin was a coastal steamship built by Joseph McGill of Shelburne, Nova Scotia on April 14, 1905. Originally owned by New Burrell Johnson Iron Co Ltd., Yarmouth, Nova Scotia, she was sold to sea merchants William A. Murdock and William J. Murdock of Sherbrooke, Nova Scotia on the same day. Under the Murdoch’s command the Dufferin served as a passenger and cargo ship between Halifax and Sherbrooke. The Dufferin steamed along coastal communities until the Hochelaga Shipping and Towing Co. Ltd. dismantled her up in 1938. Transport Canada closed the Dufferin's registry on December 31, 1937.
The Royal Navy Burying Ground is part of the Naval Museum of Halifax and was the Naval Hospital cemetery for the North America and West Indies Station at Halifax, Nova Scotia. It is the oldest military burial ground in Canada. The cemetery has grave markers to those who died while serving at Halifax and were treated at the Naval medical facility or died at sea. Often shipmates and officers had the grave markers erected to mark the deaths of the crew members who died while in the port of Halifax.
SS Athenia was the first Donaldson Line ship of that name to be torpedoed and sunk off Inishtrahull, by a German submarine (SM U-53) in 1917; the later SS Athenia, was similarly attacked in 1939.
Rosalind was a steam cargo liner that was launched in England in 1890 for Dampfschiffs Rhederei zu Hamburg as Tosari. In 1891 Deutsche Ost-Afrika Linie (DOAL) bought her and renamed her Admiral. In 1902 the Bowring Brothers' New York, Newfoundland & Halifax Steamship Company bought her and renamed her Rosalind. In 1912 the St Laurence Shipping Company bought her and renamed her City of Sydney. She was wrecked off the coast of Nova Scotia in 1914.
United Kingdom
United Kingdom, Glasgow 
