 The unusual behaviour of the bombers concerned Kapitän zur See Mecke . At 00 : 00 on 28 March , he issued a warning that there might be a parachute landing in progress . At 01 : 00 on 28 March , he followed up by ordering all guns to cease firing and searchlights to be <unk> in case the bombers were using them to locate the port . Everyone was placed on a heightened state of alert . The harbour defence companies and ships ' crews were ordered out of the air raid shelters . During all this a lookout reported seeing some activity out at sea , so Mecke began <unk> some type of landing and ordered extra attention to be paid to the approaches to the harbour . 
