Poor weather prevented raids in November and the Gotha crews occupied themselves with training flights. To lessen the chance of a raid meeting adverse weather, in December the Germans began to send out a radio-equipped Rumpler C.IV to make weather observations off the English coast. The weather cleared on 5 December, when 19 Gothas and two "Riesenflugzeuge" attacked in waves. Casualties were light but over £100,000 of damage was caused, mostly in London. Two Gothas were brought down by anti-aircraft fire and one with an engine disabled, attempted a landing at Rochford aerodrome, struck a tree on approach and crashed. The second aircraft came down near Canterbury and in both cases all the crew survived but a third aircraft and crew was reported missing.