 Complete the following phrase:  From October to December 1943 VI Corps was involved in a bruising and bloody slog advancing from Naples up the Italian peninsula against the determined rearguard defence of the German 10th Army which skillfully took great advantage of the favorable terrain in organising successive lines of prepared defenses Volturno Line, Barbara Line and Bernhardt Line. At the end of December, after heavy fighting on the Bernhardt Line the forward defenses of the formidable Winter Line defenses without a breakthrough, VI Corps was taken out of the line in an attempt to find a solution to the problem. In its second amphibious assault of the war, it 