The 1704 campaign lasted longer than usual as the Allies sought to wring out maximum advantage. Realising that France was too powerful to be forced to make peace by a single victory, Prince Eugene, Marlborough and Prince Louis met to plan their next moves. For the following year Marlborough proposed a campaign along the valley of the Moselle to carry the war deep into France. This required the capture of the major fortress of Landau which guarded the Rhine, and the towns of Trier and Trarbach on the Moselle itself. Trier was taken on 27 October and Landau fell on 23 November to Prince Louis and Prince Eugene; with the fall of Trarbach on 20 December, the campaign season for 1704 came to an end. The planned offensive never materialised as the Grand Alliance's army had to depart the Moselle to defend Liège from a French counteroffensive. The war raged on for another decade.