 Complete the following phrase:  However, the progress was stunted by corps arrival at the DrocourtQuéant Line. Otherwise known as the DQ Line, this bulwark was part of the Hindenburg Line fortifications which in late 1918, constituted the German Armys last significant organized defensive network in northern France. Built ascending up the forward slope of a hill called Mont Dury and composed of mutually-supporting machine gun and artillery emplacements with bunkers and trenches built of concrete as well as belts of barbed wire up to 100 metres thick, it was arguably the best-engineered series of defences the Canadians had faced at any point in the war. Following a two-day rest, regrouping, and planning period, the CanadianBritish assault on the DQ line began on 2 September. The 