English: Map of the Hawthorn Ridge sector of the Somme battlefield on the first day of the Battle of the Somme, 1 July 1916. British front line is shown in red. German trenches are shown in blue. German barbed wire is shown as dotted blue lines.
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[File:Ancre sector 1 July 1916.png] (Based on a British Ordnance Survey 1916 map, trenches as of 28 April 1916, held by the Liddle Collection. Units based on Map 9, The First Day on the Somme, Martin Middlebrook, 1971 and The Somme, Gary Sheffield, 2003.
Originally uploaded to EN Wikipedia 21 November 2004)
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