Priest ID

[kevinT]

I was browsing through some clips I had saved from British Pathe some time back, and came across the following.
1374.26 "The Fall of Caen". From about frame 70 to 75 are 3 M7 Priests.
"Festubert", "Escaut" and "Cheluvelt".
Only "Festubert" shows AoS of 42.
Can anybody id which unit(s) these Priests belong to? Not much to go on I know, but any help is appreciated.
The most likely candidates suggested so far 7th Field of 3 Infantry Div, or 74th Field of 50th Infantry Div.
The three names are places in Belgium where Canadian units fought during WWI. So I am edging towards a Canadian unit.

Cheers
Kevin