Two attempts at photography today. The first, in cloudy conditions in the morning, was unsuccessful. The second was a success, with at least 20 plates exposed of the River Scheldt, north of Tournai. But success was accompanied by a narrow escape, as shrapnel from anti-aircraft fire split the propeller of RE8 2517. Fortunately, Greg and his observer Lt John Macmillan were able to return safely to the aerodrome at Ascq.
Log Book
Date: 26.10.18 Time Out: 9.45 Rounds Fired – Lewis: - Rounds Fired – Vickers: - Bombs: - Time on RE8s: 178 hrs 05 mins RE8: 2517 Observer: McMillan [sic, should be Macmillan] War Flying: 0 hrs 50 mins Height: 3000 Course/Remarks: Photos – too cloudy.
Date: 26.10.18 Time Out: 12.20 Rounds Fired – Lewis: - Rounds Fired – Vickers: - Bombs: - Time on RE8s: 178 hrs 45 mins RE8: 2517 Observer: McMillan [sic, should be Macmillan] War Flying: 0 hrs 40 mins Height: 3500 Course/Remarks: Photos – 20 plates.
Although the log book gives little in the way of detail, there is more in the Squadron Record Book:
Squadron Record Book

Type and Number: R.E.8.2517
Pilot and Observer: P. Lt Gregory. O. Lt McMillan [sic, should be Macmillan]
Duty: Photography
Hour of Start: 0945, 1220
Hour of Return: 1035, 1300
Remarks: 1240. 12 24 plates exposed over I.A. & I.C. zones from 3500’.
A.A. [Anti-aircraft fire] Accurate, apparently at long range. (Propellor split by shrapnel.)
E.A. [Enemy aircraft] Nil.
Vis.Good.Clouds 3700’. Height 3500’. Obs.by P.&.O.
IA and IC Zones
Zones IA and IC together form the left hand (west) side of square I on map sheet 37. They cover the River Scheldt a few miles north of Tournai. Pont-à-Chin, the scene of yesterday’s patrol, is at the bottom of zone IC, and Pecq is at the top of zone IA:

Propeller Split
Shrapnel from anti-aircraft fire (‘archie’) hit the propeller of the aircraft and split it. The RE8’s propeller was of laminated hardwood construction, which probably limited the damage to a split. The laminations can be seen in this photograph of the RAF Museum’s replica RE8 built by The Vintage Aviator Limited of New Zealand:

In the event, the damage wasn’t so severe as to prevent the aircraft being flown back to Ascq. Nonetheless, it was certainly a case of: Archibald, certainly hot – as the song almost had it!
Lt John Gibb Brown Macmillan
Greg’s observer today was Lt John Gibb Brown Macmillan. Both Greg’s log book and the Squadron Record book spell his name as McMillan. But when Lt Macmillan signed his name on the front of the menu of the Farewell Dinner to mark the squadron’s departure from Rely on 10 October 1918, he unmistakably wrote ‘Macmillan’. See the post containing the menu here (Macmillan’s signature is above the girl’s cap):
John Macmillan was born on 19 October 1898, and so had celebrated his 20th birthday exactly one week ago. Greg’s diary says nothing about him. But the list of RFC/RAF people at airhistory.org.uk notes that on 29 June 1918 he suffered a forced landing with Lt Bill Ledlie at Créquy in RE8 C2478:
Ok [C2478 RE8] f/l Crequy due thick fog on artly patrol. Lt W Ledlie Ok/2Lt JGB Macmillan Ok
42 Squadron were operating out of Rely at the time, and Créquy is some 15 miles (24 km) southwest from Rely, towards the coast. The nearest point of the front line was 11 miles (18 km) in precisely the opposite direction. So presumably they had (seriously) overshot Rely in the fog on the way home.
The two flights today were to be the only ones in which Greg and Lt Macmillan flew together.
Next up…
The next entry in Greg’s log book is for Tuesday 29 October 1918.