^* This, and the preceding table, are taken from the Official History. To compile the second table a researcher on the Official Historian’s staff spent six months examining the Part II Orders of every infantry unit which took part in the battle on 1 July.

^* When this book was being written, in 1970, the British Army contained only fifty-four infantry battalions.

^* Public Record Office, WO 95/143S.

^† Appendix 5 gives casualty figures of the thirty-two battalions which suffered more than 600 casualties.

^‡ The old province, that is the six counties now in Northern Ireland, together with Donegal, Monaghan and Cavan, now in Eire.

^*Essex Regiment in the War, 1914-1919.

^† The History of the 9th (Service) Btn, The Tort and Lancaster Regt., 1914-1919.