HMS Niobe arrives in Halifax Harbour to become the first ship of the Royal Canadian Navy.

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.

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.

The Royal Canadian Navy is the naval force of Canada. The navy is one of three environmental commands within the Canadian Armed Forces. As of February 2024, the RCN operates 12 Halifax-class frigates, 12 Kingston-class coastal defence vessels, 4 Victoria-class submarines, 5 Harry DeWolf-class offshore patrol vessels, 8 Orca-class patrol vessels, and several auxiliary vessels. Officially, the RCN consisted of 8,400 Regular Force and 4,100 Primary Reserve sailors, supported by 3,800 civilians. However, as reported by the commander of the RCN, Vice-Admiral Angus Topshee in 2023, the "effective strength" of the regular force was considerably lower with numerous naval trades having shortages in trained strength of more than 20 percent.