During World War I , Finlayson enlisted in the 157th Battalion of the Canadian Expeditionary Force .
During World War I , Finlayson served in France as a captain in the 10th Brigade , Canadian Field Artillery .
During World War I , Finlayson enlisted in the 157th Battalion of the Canadian Expeditionary Force , and served in France as a captain in the 10th Brigade , Canadian Field Artillery .