'Mentioned in General I. Hamilton's despatch of the 26th August 1915. (Commander in Chief, Mediterranean Expeditionary Force).'
Source: 'London Gazette
Date: 5 November 1915

Source: 'London Gazette'
Date: 26 June 1916

'For devotion to duty since the outbreak of the War, as C.R.A. of the Division. He has organised trained and fought the Divisional Artillery in all operations undertaken by the Division on the Gallipoli Peninsula, and in France. The efficiency of the Divisional Artillery in every respect is entirely due to the zeal and ability displayed by this Officer. His personal influence alone has inspired all ranks under his command in that spirit which is so conducive to efficiency. I cannot too strongly recommend this Officer for reward, not only for the services he himself has rendered, but for the valuable services rendered by the Divisional Artillery to the Army.'
Source: 'London Gazette'
Date: 3 June 1918

'For distinguished and gallant services and devotion to duty. Field Marshal D. Haig. Commander in Chief the British Armies in France, despatch dated 9th April 1917.'
Source: 'London Gazette'
Date: 15 May 1917

'Brig-General Johnston is responsible for the re-organisation of the Divisional Artillery which has expanded from 6 to 15 Batteries since the 1st March last. In this work he has shown conspicuous ability and it is owing to him that the Artillery has attained a good standard. His work during the summer at Armentieres was excellent, and during the operation on the Somme from 13th September till General Sandys returned from Hospital at the end of the month Brig-General Johnston commanded the Artillery supporting the Division with distinction. I consider him an officer of very outstanding ability and confidently recommend him for a higher rank as being in the interests of the service.'
Source: 'London Gazette'
Date: 4 January 1917

'Mentioned in General I. Hamilton's despatch of the 11th December 1915. (Commander in Chief, Mediterranean Expeditionary Force).'
Source: 'London Gazette'
Date: 5 May 1916

'For distinguished services rendered during the course of the campaign.'
Source: 'London Gazette
Date: 9 March 1916

'For distinguished and gallant services and devotion to duty during the period 16th September 1918 to 15th March 1919.'
Source: 'London Gazette'
Date: 5 July 1919

'Mentioned in Field Marshall. D. Haig's despatch of 7 November 1917 for distinguished and gallant services and devotion to duty during the period February 26th to midnight September 20/21st, 1917.'
Source: 'London Gazette'
Date: 11 December 1917