An Imperial Order dated 12 February authorised the bombing of London's docks, which was interpreted by the German General Staff as permitting bombing targets east of Charing Cross. This interpretation was formally accepted by the Kaiser on 5 May 1915. The first Navy attempts to bomb London, made by L 8, failed owing to poor weather. The first was made on 26 February but turned back due to headwinds: a second attempt ended when the airship flew below the cloud base to check its position and found itself over Belgian army positions near Ostend: riddled by rifle fire, it came down near Tienen and was destroyed by the wind. A four-airship raid by the Army on 17 March ran into fog and was abandoned, one airship bombing Calais and being damaged on landing. On 20 March the three remaining Army airships set off to bomb Paris; one was lost on the return journey. Two Navy raids failed due to bad weather on 14 and 15 April, and it was decided to delay further attempts until the more capable P-class Zeppelins were in service. The Army received the first of these, LZ 38, and Erich Linnarz commanded it on a raid on Ipswich on 29–30 April and another on Southend on 9–10 May. LZ 38 also attacked Dover and Ramsgate on 16–17 May, before returning to bomb Southend on 26–27 May. These four raids killed six people and injured six, causing property damage estimated at £16,898. Twice Royal Naval Air Service (RNAS) aircraft tried to intercept LZ 38 but on both occasions it was either able to outclimb the aircraft or was already at too great an altitude for the aircraft to intercept; the B.E.2 took about 50 minutes to climb to .