 Complete the following phrase:  From intelligence obtained by traffic analysis of German radio signals, the British had concluded that major German warships were about to put to sea; Ultra intelligence obtained by breaking German codes did not provide any information on Operation Berlin as the British were unable to decrypt the codes at this time. On 20 January the Admiralty warned the Home Fleet that another German raid was likely. Tovey immediately dispatched two heavy cruisers to reinforce patrols between 