 This period, to become known as the "Three Nights' Blitz", started at 7.30 pm on 19 February.On the first night, the building housing both the Regimental HQ of 79th (Hertfordshire Yeomanry) Heavy Anti-Aircraft Regiment, Royal Artillery and the Gun Operations Room (GOR) at Swansea was destroyed by a bomb.Two officers and five other ranks were killed or died of wounds, but the guns continued firing under local control, and communications were maintained.