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. A second, at Speyer, was too immediately threatened and too far removed from the main body of German troops to be of much use to any but the defenders of Speyer itself. It would be blown late on the 23rd.