Try to find the spot where the photographer was standing.
Photo caption from AWM:
"An armoured car, carrying a French flag, moving up the main Amiens Road from Warfusee Abancourt during the advance of the 15th Australian Infantry Brigade. The two soldiers on the right are unidentified."
Come si possa pensare che l'uomo si studia sempre 'giocattoli' nuovi per fare la guerra...
What a heath robinson affair this armoured car is - seems to be dustbins bolted together
This appears to be an Austin 1918 pattern car, probably belonging to the 17th (Armored Car) Battalion of the Tank Corps. This unit was in action in France from March of 1918. I don't believe the flag is a French Tricolor, but rather a two-color signal flag - probably red and white. See: en.wikipedia.org/wiki/Austin_Armoured_Car and www.tanks-encyclopedia.com/ww1/gb/Austin_Armoured_Car.php