Not only did the doctors and surgeons in the field have to deal with the previously known ravages of warfare, they had to learn quickly how to deal with the damage being done to the soldiers by new technology - machine guns, new-and-improved hand grenades, high explosive shells, and not least of all... the first use of Chlorine Gas in the field April 1915 at the Second Battle of Ypres. Alexander arrived just in time!
On the 9th of April 1916 the 4th Battalion relieved the 1st in the trenches at The Bluff, near Ypres. While on duty the next day, April 10th, a bullet glanced off a periscope and hit Alexander in the stomach.
Soldiers with abdominal wounds were moved without delay, so Alexander would have been taken quickly from the First Aid post to the closest Dressing Station, then by Field Ambulance over rough terrain (possibly by horse-drawn wagon) to the nearest Casualty Clearing Station, which was No 17 at Remy Siding. There Private Alexander George Mavor died the next day, April 11, 1916.
Remy Siding - Casualty Clearing Stations and Hospital
If your ancestor was among the tireless doctors and surgeons practicing during war time, he may be listed in one of many books written about their units.
Following are links to a few.
List of Massachusetts physicians in the Medical Corps of the US army, navy, the Red Cross or British service during the great war 1919
List of Hospital Corpsmen: US Naval Hospital unit, Bilibid Prison Manila, PI - 1947
Base Hospital 34 in the World War - US 1922
Base Hospital No 52 : war diary - 1919
Base Hospital No 9 - 1920
Pennsylvania hospital unit - Base Hospital No 10, US 1921
US Naval Receiving Hospital Dec 1944 - Dec 1945 Anniversary Booklet
A history of Base Hospital 32 (including Unit R) - 1922
Roster of all regimental surgeons and assistant surgeons in the late war, with their service, and last known address - 1882
No 5 Australian General (Base) Hospital Melbourne
A History of No 7 (Queen's) Canadian General Hospital 1915-1917
The Casualty Clearing Stations of WWI
The Australian Army Medical Corps n Egypt; 1914-1915 (names near back)
The Story of a Red Cross unit in Serbia - UK 1916 (names in back)
Awards for members of Czechoslovak field hospital in Korea - 1953
Chronological history (+ photos) of the 363th field hospital company - 1921
Facts and Fancies (+ photos) of 363rd field hospital company - 1919
Surgery at a Casualty Clearing Station - 1918
Medical Units of the BEF - WWI 1921
Regimental surgeons of the State of New York, in the War of the Rebellion 1861-63
Women as army surgeons : being the history of the Women's Hospital Corps in Paris, Wimereux and Endell Street ; September 1914 - October 1919
Canadian Army Medical Corps reinforcements Nominal Roll 1915
Historical records of No 8 Canadian Field Ambulance: Canada, England, France, Belgium