A support company of the Tyneside Irish Brigade advancing from the Tara-Usna Line opposite La Boisselle on 1 July, 1916
The tunnel for the Lochnagar mine was started on 11 November 1915 by 185 Tunnelling Company, but was completed by 179 Tunnelling Company who took over in March 1916.
In the front line, astride the road,
was the 102nd (Tyneside Scottish) Brigade
with 1st and 4th Tyneside Scottish) to the left
and 21st and 23rd N.F. (2nd and 3rd Tyneside Scottish) to the right,
alongside 101st Brigade, with its battalions,
the 10th Lincolns (Grimsby Chums),
the 11th Suffolks (Cambridge Pals)
and 15th and 16th Royal Scots, on the right of the Divisional line.
The 103rd (Tyneside Irish) Brigade in support about a mile behind the front line.
They suffered many casualties that day - five battalions losing over 500 men each. Indeed the whole division lost 6,380 that day.