Further raids were delayed by an extended period of poor weather and also by the withdrawal of the majority of Naval Zeppelins in an attempt to identify and resolve the recurrent mechanical failures. Raids resumed in March: three Zeppelins set off to bomb Rosyth on 5–6 March but were forced by high winds to divert to Hull, killing 18, injuring 52, and causing £25,005 damage. On 30 March – 1 April ten airships set off to bomb eastern England and London. Most turned back because of mechanical problems or the weather; L 15 was intercepted by Claude Ridley, who was unable to do more than fire a few rounds at extreme range; it was then damaged by anti-aircraft fire over Purfleet before being attacked by Alfred de Bathe Brandon using Ranken darts. It came down in the sea near Margate, all but one of the crew surviving. Most of the 48 killed in the raid were victims of a single bomb which fell on an Army billet in Cleethorpes. The following night two Navy Zeppelins, diverted from London by the weather, bombed targets in the north of England, killing 22 and injuring 130. On the night of 2–3 April, a six-airship raid was made by Army and Navy airships, the Navy targeting the naval base at Rosyth and the Forth Bridge on the east coast of Scotland and the Army targeting London. None of the airships bombed their intended targets; 13 were killed, 24 injured and much of the £77,113 damage was caused by the destruction of a warehouse in Leith containing whisky. A two-Zeppelin raid the following night was prevented from bombing London by the weather and caused no casualties or damage, and another against the north of England on the night of 5–6 April had little effect: one of the three raiders turned back with mechanical problems, and although the ironworks at Skinningrove and a colliery near Bishop Auckland were bombed the casualties only amounted to one dead and nine injured.