 On 23 January , Hipper sortied , with Seydlitz in the lead , followed by Moltke , Derfflinger , and Blücher , along with the light cruisers Graudenz , Rostock , Stralsund , and Kolberg and 19 torpedo boats from V Flotilla and II and XVIII Half @-@ Flotillas . Graudenz and Stralsund were assigned to the forward screen , while Kolberg and Rostock were assigned to the starboard and port , respectively . Each light cruiser had a half @-@ flotilla of torpedo boats attached . 
