Mike Pohjola: I think the story you are looking for is a DD adventure called "The Secret Of The Glacier" drawn not by Barks but by Tony Strobl.In the Swedish list of DD&Co this story is referred to as 6052-02 W DD 51-02 20. US has lost his sleigh in a whole in a glacier and to be able to come back and rescue it later he marks the place with his rifle. Karl-Erik Tallmo