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FrankHurleyAustralian.inchHowitzerGunnersInGasMasks. in Howitzer of the nd Australian Siege Battery in action Identified left to right Gunner Gnr hass adfa edu au pid Dalgliesh hass adfa edu au pid Gnr Scoles hass adfa edu au pid Gnr Hislop The gunners are wearing their gas respirators Note the camouflage screen overhead