Rank: Lieutenant
This Boer-War Soldier record for Arthur W MACARTHUR-ONSLOW 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=151753&r=Arthur W&s=MACARTHUR-ONSLOW&ref=