[1] Attached to the Army Service Corps, he was promoted to lieutenant on 3 August 1902,[2] while still in South Africa.
Arthur McNalty served, finally, from 1914 to 1919 during WWI in Egypt, Turkey (during the Dardanelles Campaign or Battle of Gallipoli) and France, during which he had 6 combat despatches and completed his service as a Brigadier General or Brigadier (in field command, a commander of a brigade or three battalions, that is approximately 3000 troops).
McNalty, subsequently, acted as Director General of grave registrations and enquiries from 1919 and until his retirement from service in the British Armed Forces in 1920.
There were two children of the marriage:[4] Arthur McNalty's father, British Army brigade surgeon Lt. Col. George William McNalty, MD, LRCSI, FRCSI, CB (1837–1912) invented (1873) the "iron wire folding fracture box" or splint, which was intended for use on the battlefield and in mass casualty situations and which foreshadowed the German surgeon Friedrich Cramer's (1847–1903) later invention of the Cramer wire ladder splint or the malleable wire ladder splint, which was developed for the same purposes and which is still used widely to this day individually or in multiple for emergency splint of fractured limbs.
[5][6][7][8] George William McNalty's daughter and Arthur George McNalty's sister, Elizabeth Ann McNulty, was the wife of the Irish surgeon Andrew Sexton Gray, who is known as the "founder of ophthalmology in Australia".