The following article contains an answer for the question: From what location did convoys depart under the protection of British cruisers and destroyers? , can you please find it? 

Dartmouth lies on the east shore of Halifax Harbour, and Halifax is on the west shore. Halifax and Dartmouth had thrived during times of war; the harbour was one of the British Royal Navy's most important bases in North America, a centre for wartime trade, and a home to privateers who harried the British Empire's enemies during the American Revolution, the Napoleonic Wars, and the War of 1812.The completion of the Intercolonial Railway and its Deep Water Terminal in 1880 allowed for increased steamship trade and led to accelerated development of the port area, but Halifax faced an economic downturn in the 1890s as local factories lost ground to competitors in central Canada.  The British garrison left the city in late 1905 and early 1906. The Canadian government took over the Halifax Dockyard (now CFB Halifax) from the Royal Navy. This dockyard later became the command centre of the Royal Canadian Navy upon its founding in 1910.Just before the First World War, the Canadian government began a determined, costly effort to develop the harbour and waterfront facilities. The outbreak of the war brought Halifax back to prominence. As the Royal Canadian Navy had virtually no seaworthy ships of its own, the Royal Navy assumed responsibility for maintaining Atlantic trade routes by re-adopting Halifax as its North American base of operations. In 1915, management of the harbour fell under the control of the Royal Canadian Navy under the supervision of Captain Superintendent Edward Harrington Martin; by 1917 there was a growing naval fleet in Halifax, including patrol ships, tugboats, and minesweepers.The population of Halifax/Dartmouth had increased to between 60,000 and 65,000 people by 1917. Convoys carried men, animals, and supplies to the European theatre of war. The two main points of departure were in Nova Scotia at Sydney, on Cape Breton Island, and Halifax. Hospital ships brought the wounded to the city, and a new military hospital was constructed in the city.The success of German U-boat attacks on ships...

Bedford Basin