At 11am on 11 November 1918, hostilities ceased after an agreement was made between both sides' military leaders. In acknowledgement of the day, the Royal Family made several balcony appearances at Buckingham Palace. This flag was held by Queen Mary during these appearances.

Dull first, rain in the afternoon. The greatest day in the world's history. The armistice was signed at 5am & fighting ceased at 11. U. Arthur came to breakfast & at 11 we went on to the balcony to greet the large crowd which had formed outside. At 12.30 we went out again & the massed bands of the Guards played the National Anthem & patriotic songs & the anthems of the Allies. Huge crowds and much enthusiasm... The Prime Minister came to see us at 7. U. Arthur & Patsy came to dinner, afterwards we went on to the balcony, the band played popular songs, & we had another wonderful scene. A day full of emotion & thankfulness - tinged with regret at the many lives who have fallen in this ghastly war.

RA, Queen Mary's Journal, 11 November 1918