Editing First day on the Somme (section)

====Supply====
{|class="wikitable" align=right style="margin:0 0 1em 1em"
|+<small>'''BEF railway tonnage (1916)'''</small>{{sfn|Henniker|2009|p=179}}
|-
! Month
! [[long ton|LT]]
|-
|Jan||align="right"|2,484
|-
|Feb||align="right"|2,535
|-
|Mar||align="right"|2,877
|-
|Apr||align="right"|3,121
|-
|May||align="right"|3,391
|-
|Jun||align="right"|4,265
|-
|Jul||align="right"|4,478
|-
|Aug||align="right"|4,804
|-
|Sept||align="right"|4,913
|-
|Oct||align="right"|5,324
|-
|Nov||align="right"|5,107
|-
|Dec||align="right"|5,202
|}
From 1 January to 3 July 1916 the BEF was reinforced by {{nowrap|17 divisions}} and the number of heavy guns increased from {{nowrap|324 to 714.}} The new divisions needed {{frac|51|1|2}} supply trains a week to meet daily needs and a large number of extra trains to transport heavy artillery ammunition. Until mid-June, ammunition supply for the BEF needed {{nowrap|5–12 trains}} per week, then rose to 45 to 90 trains a week, to deliver {{cvt|148000|LT}} of munitions. Ammunition expenditure became a concern by 12 July but deliveries to the area behind the Fourth Army kept pace, although transport from railheads to the guns was not always maintained. In the weeks before 1 July, an extra seven trains a day were sufficient to deliver ammunition.{{sfn|Brown|1996|pp=159–162}} In the rear of the Fourth Army, huge encampments were built for troops, horses, artillery and workshops, dumps were filled with equipment, reservoirs and pipelines.{{sfn|Philpott|2009|pp=157–160}}

Power stations, light railways roads and telephone networks were constructed and more than {{cvt|2000000|impgal}} of petrol per month was delivered for the lorry fleet, moving supplies up to {{cvt|3|mi}} from railheads to the front line. A million [[Brodie helmet]]s were delivered between January and June. In the [[37th Division (United Kingdom)|37th Division]] area, {{nowrap|91,420 man-hours}} were needed to dig {{cvt|6|km|order=flip}} of trenches, jumping-off points, command-posts, dug-outs, machine-gun emplacements and ammunition stores, for wiring and for maintenance. In the French Sixth Army sector, one railway line from Amiens led to [[Bray-sur-Somme]] on the north bank but on the south bank there were no rail lines; road convoys carried supplies from Amiens to [[Foucaucourt-en-Santerre]].{{sfn|Philpott|2009|pp=157–160}}