Huguet toured the Charleroi to Namur area. However, little further progress was made until after Wilson became DMO in 1910. Grierson was then appointed General Officer Commanding, 1st Division at Aldershot Command in 1906 and General Officer Commanding-in-Chief for Eastern Command in 1912. In the Army Manoeuvres of 1912, he made full use of aircraft reconnaissance to decisively beat Douglas Haig, despite Haig having the odds in his favour. In the Army Manoeuvres of 1913, Grierson acted as Chief of the General Staff (CGS) for Sir John French. Douglas Haig noted in his diary, "Sir John French's instructions for moving along the front of his enemy (then halted on a fortified position) and subsequently attacking the latter's distant flank, were of such an unpractical nature that his Chief of the General Staff demurred. Some slight modifications in the orders were permitted, but Grierson ceased to be his CGS on mobilization, and was very soon transferred to another appointment in the BEF." Even before leaving the field of the manoeuvres (26 September 1913), French told Wilson that he was not satisfied with Grierson's performance. Murray was appointed chief of staff designate in his place. French himself described Grierson as a "dear old friend and comrade", ..who astonished French soldiers by his knowledge of the history of their regiments and whose "military acquirements were brilliant and in every respect up to date." Grierson was very overweight, and used to go red in the face from bending over, due to high blood pressure, and Edmonds later claimed that his staff were issued with penknives to bleed him if necessary. He died of an aneurism of the heart on a train, near Amiens at 7:00 a.m. on 17 August 1914. His replacement as commander of II Corps was Sir Horace Smith-Dorrien. Grierson spoke French fluently and was a personal friend of Haig, the commander of I Corps, so it is possible that relations over the next few days, both between the two British corps and with the French, might have been better had he lived. Grierson's body was repatriated, a practice allowed at that time, and is buried in the Glasgow Necropolis in PRIMUS 38 with his sister, father and mother. These were full interments. The grave lies north of the path connecting the south-east corner of the upper plateau with the low-lying southern section. Recognition The Sir James Moncrieff Grierson Prize for languages