 In the following years Möller would continue to be promoted, reaching the rank of lieutenant-general in April 1773.As a senior officer of Russia's artillery branch, Möller was made a member of the Main Chancellery for Artillery and Fortifications in 1772 and soon became its preeminent member.After the death of Prince Grigory Orlov in 1783 Möller succeeded him as General Feldzeugmeister, the titular head of the Imperial Army's artillery corps (he had been "de facto" head for several years before that), and was promoted to the rank of general-in-chief.