buildings inside Canada as well, and once again flew over Parliament. The Red Ensign served as the country's civil ensign from 1892 to 1965 when it was replaced by today's Maple Leaf flag. The flag bore various forms of the shield from the Canadian coat of arms in its fly during the period of its use. From 1922 until 1957, the Canadian Red Ensign was virtually the same, except that the leaves in the coat of arms were green, and there was a slight alteration to the Irish harp (the earlier version having a woman's bust as part of the harp). A blue ensign, also bearing the shield of the Canadian coat of arms, was the jack flown by the Royal Canadian Navy and the ensign of other ships owned by the Canadian government until 1965. From 1865 until Canadian Confederation in 1867, the United Province of Canada could also have used a blue ensign, but there is little evidence such a flag was ever used. In Otto Reinhold Jacobi's painting of the new Parliament Buildings in 1866, a Red Ensign flies from the tower of the East Block. In 2007, the Canadian Red Ensign was formally recognized as a "national symbol of Canada," by the Public Register of Arms, Flags and Badges of Canada. Vimy Ridge Red Ensign The Red Ensign carried by the 5th Canadian Infantry Battalion (Western Cavalry) at the Battle of Vimy Ridge in 1917 survives to this day, and is possibly the oldest Canadian flag in existence. The battle was the first time all four divisions of the Canadian Expeditionary Force fought together during the First World War, and is viewed as a pivotal event in the history of Canadian national identity. The Red Ensign flown at Vimy Ridge in 1917 had the arms of Canada's first four provinces. In the Royal Warrant of 1868 assigning arms to the first four provinces of Canada, Queen Victoria authorized them to be quartered for use on the Great Seal of Canada and thus de facto they became the arms for Canada until 1921. After the battle, the flag was donated to the Imperial War Museum in the United Kingdom by Lieutenant-Colonel Lorn Paulet Owen Tudor of the 5th Battalion, an Englishman who had emigrated to Canada before the war. The Imperial War Museum refused requests over the years to repatriate the Vimy Ridge Red Ensign to Canada,