 By nightfall of the 22nd, a column of the 12th Armored stood only from Speyer, and on the 23rd, the 14th Armored broke through the Westwall at Steinfeld and began its advance on Germersheim.To forestall a second Remagen, by 19 March the Germans had blown all Rhine bridges from Ludwigshafen northward.Of three that remained upstream, the southernmost, the Maxau Rhine Bridge at Maximiliansau, was destroyed on 21 March when a round of American artillery fire struck a detonator, setting off prepared demolitions.