Ronald MacKinnon was born on August 27, 1893, and enlisted in Toronto on September 10, 1915, serving first with the 81st Battalion. The unit went overseas in April 1916, but was broken up to reinforce other battalions, with Ronald being transferred to the Royal Canadian Regiment. He reached France in June, and shortly thereafter was wounded in the fighting at Sanctuary Wood, near Ypres. In November 1916 he was passed fit for duty and was posted to the Princess Patricia's Canadian Light Infantry. Private Ronald MacKinnon was killed in action at Vimy Ridge on April 9 -10, 1917. The collection currently consists of thirty nine letters and two photographs. See also the collections of his uncle William and his brother Archibald MacKinnon.