"Battery 628" was initially ordered to the Vistula Front on 7 March, but this was countermanded on 11 March when it was rerouted towards Remagen, where the Allies had recently captured the Ludendorff Bridge. Karl-Batterie 638 arrived on 20 March, but after only 14 rounds that missed all of the bridges and only damaged a handful of random houses, the weapon had to be moved to the rear for repairs. Batterie 428 was also ordered towards Remagen on 11 March, but was rerouted to the 1st Army sector instead.