This photograph, taken by official British Army photographer Ernest Brooks, shows Captain Paget MC and Second Lieutenant Barry MC of the 1st Battalion, Irish Guards, reading full details of the armistice with Germany to their men on 12 November 1918. All military operations had ceased on the preceding day at 11am on 11 November 1918.
Link: https://www.iwm.org.uk/history/how-did-the-armistice-end-the-first-world-war