2/Lt. (later Captain) Robert Finlayson Sinclair : 14th battalion Manchester Regt. & Royal Flying Corps.
Tracing the sequence of the military career of this officer has not been easy. The records indicate that he was a 2nd Lt. on the 5th October 1915 in the Manchesters and later at Catterick Aerodrome where he was attached in that rank to No. 14 (Reserve) Squadron of the RFC, later holding the rank of Lt. and still with the Royal Flying Corps.
However, he saw active service with the 1/5th (The Sutherland & Caithness Highland) Battalion Seaforth Highlanders and again from the records, he is listed as a POW in the rank of Captain with the 5th Seaforths under date 21st March 1918 with a repatriation date of January 1919. In this regard, returning POW's were interviewed in respect of the circumstances of their capture (as also in WW2), and I see that his papers are annotated "Exonerated Officers List".
I think it would be possible to say, that for some reason (medical down-grading?), he left the RFC and joined the 5th Seaforths, a battalion with roots in Caithness where the family lived. As regards the 5th Seaforths on the 21st March 1918, they were part of 152 Infantry Brigade of the 51st (Highland) Division of the Third Army holding the line in front of Doignies. It is clear from the Official History of the Great War, that the battalion suffered severely in the enemy advance of the 21st March and it must be presumed that it was during this fighting that Sinclair was taken prisoner.
After discharge from the army, it would appear that at some time later he took a post in Borneo, perhaps on a rubber plantation. However, in December 1941 the Japanese entered the Second World War and in due course their army occupied Borneo. Sinclair is recorded by the CWGC as a civilian death and dying during the month of September 1942. He was 47 years old. His name is recorded in the Civilian War Dead Roll of Honour in Westminster Abbey.
PhilipG.