Source: WO158/1218.

From "The infantry cannot do with a gun less": the place of the artillery in the British Expeditionary Force, 1914-1918 by Sanders Marble

  • European: 1800-present
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  • Diagram 3: Range Card for Defence. Each and every gun in a defensive position would have one of these range cards prepared. It would show the various close range targets that the gun would be expected to engage, so that targets could be engaged quickly. Source: WO158/1218.