sentences:  He then also accompanied Sir Charles Warren's expedition in pursuit of the murderers of Professor Edward Palmer and his associates.He went on to serve in operations against Osman Digna who was threatening Suakin in Spring 1884 during the Mahdist War.Burney returned to Portsmouth to attend the gunnery school HMS "Excellent" in September 1884 and then joined the staff at the gunnery training ship HMS "Cambridge" at Devonport in June 1886.