This map is for the assault on the Drocourt-Quéant Line, 2-3 September 1918. The creeping barrage supported the advancing infantry troops. The curtain of shells, indicated here by the tight cluster of thin vertical lines, moved forward, in this case from left to right, in a series of 100-yard lifts (about 91 metres).
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Field Service Battalion, Royal Engineers</div>
George Metcalf Archival Collection