 Complete the following phrase:  In 1943, the German battleship Scharnhorst moved to Norway, a position whence she could threaten the Arctic convoys to Russia. With Tirpitz and two armoured ships also in Norwegian fjords, it was necessary for the Royal Navy to provide heavy escorts for convoys between Britain and Russia. One of these was sighted by the Germans in early December 1943, and Allied intelligence concluded that the following convoy, 