Since when he Francis Wallace Grenfell's rank in the British Army been the highest rank?
Francis Grenfell, 1st Baron Grenfell Field Marshal Francis Wallace Grenfell, 1st Baron Grenfell, GCB, GCMG, PC (29 April 1841 – 27 January 1925) was a British Army officer. After serving as aide-de-camp to the Commander-in-Chief, South Africa, he fought in the 9th Xhosa War, the Anglo-Zulu War and then the Anglo-Egyptian War. He went on to become Sirdar (Commander-in-Chief) of the Egyptian Army and commanded the forces at the Battle of Suakin in December 1888 and at the Battle of Toski in August 1889 during the Mahdist War. After that he became Governor of Malta and then Commander-in-Chief, Ireland before retiring in 1908.
Nevill Smyth Major General Sir Nevill Maskelyne Smyth {'1': ", '2': ", '3': ", '4': "} (14 August 1868 – 21 July 1941) was a senior officer in the British Army and a recipient of the Victoria Cross, the highest award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces.