Proposals to bomb Britain were first made by Paul Behncke, deputy chief of the German Naval Staff, in August 1914. These were backed by Alfred von Tirpitz, who wrote that "The measure of the success will lie not only in the injury which will be caused to the enemy, but also in the significant effect it will have in diminishing the enemy's determination to prosecute the war". The campaign was approved by the Kaiser on 7 January 1915, who at first forbade attacks on London, fearing that his relatives in the British royal family might be injured. Following an attempt on 13 January 1915 which was abandoned because of the weather, the first successful raid took place on the night of 19–20 January 1915. Two Zeppelins intended to attack targets near the River Humber but were diverted by strong winds, and dropped their bombs on Great Yarmouth, Sheringham, King's Lynn and the surrounding Norfolk villages. Four people were killed and 16 injured. Monetary damage was estimated at £7,740 (GB£ in ). The raid prompted alarmist stories about German agents using car headlights to guide Zeppelins to their targets, and there was even a rumour that a Zeppelin was operating from a concealed base in the Lake District.