In 1930, Percival spent a year studying at the Royal Naval College, Greenwich. From 1931 to 1932, Percival was General Staff Officer Grade 2, an instructor at the Staff College. The college's commandant General Sir John Dill, became Percival's mentor over the next 10 years, helping to ensure his protégé's advancement. Dill regarded Percival as a promising officer and wrote that "he has an outstanding ability, wide military knowledge, good judgment and is a very quick and accurate worker" but added "he has not altogether an impressive presence and one may therefore fail, at first meeting him, to appreciate his sterling worth". With Dill's support, Percival was appointed to command the 2nd Battalion, the Cheshire Regiment from 1932 to 1936, initially in Malta. In 1935, he attended the Imperial Defence College.