Later, he was made the commander of a Jagdtiger company of the 512th Heavy Anti-tank Battalion at the beginning of 1945, which by that time was engaged in fighting on the Western Front. On 8 March 1945, the 2nd Company under Carius was directed to the frontline near Siegburg where it took part in the defense of the Rhine against the American forces crossing the river, with limited successes in keeping them back. Eventually, after being trapped in the Ruhr Pocket east of the Rhine, he ordered all his Jagdtigers destroyed (to prevent enemy forces from capturing them intact) and then surrendered to the US Army on 7 May 1945.