trail-plankn. a plank for supporting the trail of a gun-carriage.
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society > armed hostility > military equipment > weapon > device for discharging missiles > firearm > gun carriage > [noun] > planks to support gun or carriage
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1859 F. A. GriffithsArtillerist's Man. (1862) 115 One trail plank... This plank is placed on the ground, so that the trail of a siege carriage may rest on it.