The letters are arranged in the order of the date on which they were disposed of. In order to trace a particular letter this date must be found in the series IOR/Z/L/MIL/2/5-71 Memoranda of Military References, and see also IOR/Z/L/MIL/2/1-4 Registers and Indexes 1816-1858.
A continuation of the sub-series IOR/L/MIL/2/1-720 Military Home Correspondence Letters Received 1830-1860. The letters are arranged in the order of the register number given to all incoming letters. This number can be found in the series IOR/Z/L/MIL/2/5-71, Memoranda of Military References