A simple row of spruce trees marked the finish line for Canadian army reservists and combat members after a marathon two months pushing through one of the harshest environments on Earth: Canada's vast Arctic. The patrol, which ended on Friday in Churchill, Manitoba, was the largest northern mission in the history of the Canadian Rangers - a branch of the Canadian Armed Forces responsible for monitoring the country's remote regions. For 5,200km (3,200 miles), they moved across the Arctic,