(British) Army List - 1 April 1865
Page 440 notes that Cornet Childs from the 16th Lancers has become a Lieutenant in the 1st Dragoon Guards by the purchase of a commission vice (meaning in this context "in place of") Reeves, who retires on 7 March 1865.
Page 449, notes the retirement by Sale of Commission of Lieutenant Reeves.
Commentary
There is no given name noted for this Reeves in this entry, but reference to earlier editions of the British Army List suggest this would be Edward Hoare REEVES.Edward is however still listed in this edition as serving with the 1st Dragoon Guards, see 18650401_Army_List_Reeves_Edward_H