Rank: Lieutenant Colonel
This Boer-War Soldier record for O'Donnel Colley GRATTAN was transcribed record from various documents held at the National Archives, South Africa. Data contained in this set is known as "The Soldiers of the Queen".
https://www.gendatabase.com/boer-war-soldiers-record.php?q=96675&r=O'Donnel Colley&s=GRATTAN&ref=
