However H. H. Asquith, the Prime Minister, sought changes in senior military positions. Haig, about to be appointed Commander-in-Chief of the BEF (3 December 1915), rejected Kitchener's suggestion that Murray be reappointed as Chief of Staff BEF (the job which Robertson was vacating to become CIGS).[57] In his final days in office Murray issued a paper urging concentration of effort on the Western Front (16 December 1915) which was described by Robertson as the "Bible of the war".[2] Murray was forced out as CIGS on 23 December 1915[58] and replaced by Robertson, a strong advocate of the single (Western) front strategy.[59]