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Martin Windrow mentions it in his book "Our Friends Beneath the Sands" as supporting the FFL which took heavy casualties in a battle against the Riffs in 1925, so definatly post war... though they proved to be ineffective in the rocky terrain.... Mortars likely stokes or similar are also mentioned as supporting, so the crew may work for those as well.
1916 is the date the gun was accepted by the Army Commission not specifically the FFL.