After the invasion of the Falkland Islands by Argentina in early April 1982, in mid-June 1982 Scott commanded the victorious attack of the 2nd Battalion of the Scots Guards and supporting units at the Battle of Mount Tumbledown against positions held by the Argentinian Marines' 5th Naval Infantry Battalion, which cleared the way to Port Stanley and ended the war. At the conclusion of the campaign he was awarded the Distinguished Service Order.