Constable (CID). Both men were encouraged to liaise with Monro behind Warren's back. Jack the Ripper Warren's biggest difficulty was the Jack the Ripper case. In his book, Abberline: The Man Who Hunted Jack the Ripper, author Peter Thurgood indicates that Warren was criticised during the investigation. He was blamed for failing to track down the killer, accused of failing to offer a reward for information (although that plan was actually rejected by the Home Office), accused of assigning an inadequate number of investigators (patently untrue) and favouring uniformed constables instead of detectives (probably untrue). In response, Warren wrote an article outlining his views and the facts for Murray's Magazine; the article also indicated that he favoured vigilante activity in finding the Ripper. He was censured by the Home Office for revealing the workings of the police department and for writing an article without permission. As recently as 2015, a book about the Ripper case by Bruce Robinson castigated Warren as a "lousy cop" and suggested that a "huge establishment cover-up" and a Masonic conspiracy had been involved. In its book review, The Guardian stated that "most historians put the police's failure to catch the Ripper down to incompetence" but did not specifically name Warren in this context. Warren finally had enough of criticism and resigned – coincidentally right before the murder of Mary Jane Kelly on 9 November 1888 and returned to his army career. Nearly every superintendent on the force visited him at home to express their regret over his resignation. One attendee praised Warren for his thoughtfulness and his caring for the men in his command. He returned to military duties. He was appointed a Knight Commander of the Order of the Bath (KCB) on 7 January 1888. Later military career and Boer War In 1889, Warren was sent to command the garrison in Singapore and promoted to the rank of Major-General in 1893 remaining in Singapore until 1895. After returning to England, he commanded the Thames District from 1895 to 1898, when he was promoted to lieutenant general in 1897 and was moved to the Reserve List. Royal Engineer Yacht Club Watermanship being one of the many skills required of the Sapper led to the formation of a sailing club at the School of Military Engineering in 1812 and later to the development of cutter rowing teams. Construction of a canal linking the Thames and Medway