Rawson joined the
Royal Navy in 1857 and took part in the capture of the
Taku Forts in 1860 during the
Second Opium War. Promoted to
captain in 1877, he was given command of . and held that post at the time of the Benin Expedition which was regarded in British circles largely as a stroke of disciplined and coordinated planning: In twenty-nine days a force of 1,200 men, coming from three places between 3000 and 4500 m. from the Benin river, was landed, organized, equipped and provided with transport. Five days later the city of Benin was taken, and in twelve days more the men were re-embarked, and the ships coaled and ready for any further service. Rawson was also the commanding officer of the British forces in the
Anglo-Zanzibar War, the shortest war in history, which lasted for 38 minutes on 27 August 1896. For this he was made a Knight Commander of the
Order of the Bath and a first class member of the
Order of the Brilliant Star of Zanzibar. He commanded the
Channel Squadron from 1898 to April 1901, with
HMS Majestic as flagship. He was also a recipient of the Grand Cross of the Military
Order of Aviz of Portugal,
Order of Hamondieh of Zanzibar and
Order of Osmanieh of the
Ottoman Empire and
Civic Cross of Belgium. ==Colonial service==