Letters from Gen Sir Douglas Haig, General Officer Commanding in Chief, British Armies in France, and Gen Sir Herbert Charles Onslow Plumer, General Officer Commanding 2 Army, concerning planning for the Somme offensive, Jul-Nov 1916, notably a brief examination by Haig of the strategic situation prior to a meeting with French Gen Joseph Jacques Cesaire Joffre, Commander in Chief of the French Armies on the Western Front, and French Gen Nöel Joseph Edouard de Curières de Castelnau, his Chief of Staff, May 1916; his meeting with the British War Council and negotiations with the French concerning the start date of the coming offensive, Jun 1916; discussion between Haig and Plumer through Kiggell concerning recent operations by 2 Army on the Ypres Salient (Battle of Mount Sorrel), Jun 1916, and the proposed move of 3 Div to 4 Army in preparation for the Somme Offensive. 4 items, 11pp.