The story explains how Huey, Dewey and Louie originally joined the Junior Woodchucks. Years ago, when the boys were still very small, they were up to so much mischief that Donald finally got fed up with it and decided that something must be done. By chance, he ran across a scout group of the Junior Woodchucks, and this inspired him to send his nephews to join the organisation.
At the annual grand jamboree of the Junior Woodchucks, the boys discovered that their own grandmother is the daughter of the organisation's founder. Thus interested, the boys wanted to join the Junior Woodchucks immediately. The chiefs originally didn't want to accept them, but when they learned they were the great-great-grandchildren of their original founder, they accepted them immediately. They never had descendants of their founder before, even though Huey, Dewey and Louie weren't the first ones to try; Donald had also tried to join them, but was rejected because of his bad temper.
As novices in the Junior Woodchucks, the boys' first task was to find the remains of the Fort Duck, which was demolished to make room for Scrooge McDuck's Money Bin. The trail led the boys, accompanied by Major Snozzie, to a wood pulp factory owned by Scrooge, where the logs from the fortress were about to be made into pulp. But when the worker responsible for the pulp making learned of the logs' origin, as a former Junior Woodchuck himself, he immediately stopped the machines, to avoid destroying the historical remains.
The story ends with the boys being promoted to full members of the Junior Woodchucks and Donald being awarded an honorary medal.