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After departing on a training cruise, "Niobe" ran aground in fog off Cape Sable, Nova Scotia, on the night of 30–31 July 1911. Damage control saved the ship. The repairs took six months, completing in January 1912, and she had a permanently reduced maximum speed as a result. The resulting court martial found that the navigating officer, Charles White, who had not been on the bridge, should have been present during the navigation of the area due to its difficulty, and also found Captain W. B. MacDonald negligent for not ensuring his officers were performing their duties properly.