Herbert Karslake was twice mentioned in despatches for 'distinguished and gallant service and devotion to duty... deserving of special mention’’ by the commander of the Mesopotamian Expeditionary Force, Leiut-General W.R. Marshall. The despatches, on 15 April 1918 and 7 February 1919, are recorded in the London Gazette on 23 August 1918 and 12 January 1920.