Newcome was commissioned into the Royal Artillery and saw action in South Africa during the Second Boer War.[2]
He was promoted from supernumerary captain to captain in January 1905.[3]
He served on the Western Front in the First World War, which began in the summer of 1914, with the Royal Field Artillery for which he was appointed a Companion of the Distinguished Service Order (DSO). The citation for his DSO appeared in The London Gazette in April 1915 and reads as follows:
For the excellent work performed throughout the campaign, especially on the 10th and 11th March, 1915, during the action at Givenchy, when he directed the fire of his Battery from a ruined house with great skill whilst exposed to very heavy rifle fire.
The reports furnished by Major Newcome during the engagement were of the greatest value.[4]
He was seconded from his regiment and served as a general staff officer, grade 2 from August 1915.[5] He was then the brigadier general, Royal Artillery in the 21st Division from May 1917 to November 1918.[7] In January 1918 he was made a brevet colonel.[8]
After the war he succeeded Brigadier-General William Basil Browell as Commandant of the Chapperton Down Artillery School in November 1918,[9] became Commander, Royal Artillery at Northern Command in April 1923 and, promoted to major general in March 1927,[10] General Officer Commanding Baluchistan District in India in March 1931.[11] He went on to be Major-General, Royal Artillery for the Indian Army in February 1933 and then General Officer Commanding the 50th (Northumbrian) Division from April 1928[12] until he retired in February 1931.[11]
He was appointed a Companion of the Order of St Michael and St George in the 1919 New Year Honours[13] and Companion of the Order of the Bath in the 1923 New Year Honours.[14]
He was buried in Upper Hale Cemetery in Farnham in Surrey.[15]