Sharp white frost. Cold day, some sun in afternoon. Hung up pictures in living room. Warning at 8.15 p.m. A nasty raid; many incendiaries quite near probably on Wimbledon Estate or Dundonald. Also many explosive bombs some quite near: expect I shall hear. Raid seemed on London area. All clear at 2.7 a.m. on 20 Thur.
On this day: battleship Malaya damaged by torpedo from U.106; the Malaya becomes first major British warship to be repaired in US, when it sails to New York. And Hitler issues an ultimatum to Yugoslavia, stipulating virtual German control of the country.