Army cadets put flags in front of the graves during the Vimy Ridge Day commemoration at the Mountain View Cemetery in Vancouver, Canada, on April 7, 2019. Four hundred army cadets attended the ceremony here on Sunday to mark the Vimy Ridge Day, a day to commemorate the deaths and casualties of the Battle of Vimy Ridge during the First World War. The day is observed annually on April 9. (Xinhua/Liang Sen)