Hi there,
William T Cosby b.1879 in Leighton Buzzard, moved to Kidlington in Oxfordshire in the mid 1880s. We know he was in France in WW1 and was court martialled at some point for shooting a French civilian who had killed a child (I can't find a record for this).
We can't work out what regiment he was in and I wondered if someone might be able to help by looking at his uniform please (if you click on the image there is also a man in uniform standing to the right).
He is the man on the horse.
Thank you and best wishes,
Emma