A second fire on 4 January 1698 destroyed most of the remaining residential and government buildings. It was started inadvertently by a servant in an upper room who had hung wet linen around a burning charcoal brazier to dry. The linen caught fire and the flames quickly spread throughout the palace complex, raging for 15 hours before firefighters could extinguish it. The following day, the wind picked up and re-ignited the fire farther north. Christopher Wren, then the King's Surveyor of Works, was ordered expressly by William III to focus manpower on saving the architectural jewel of the complex, the Banqueting House. Wren ordered bricklayers to block-up the main window on the building's south side to block the flames from entering. Around 20 buildings were destroyed to create a firebreak, but this did little to inhibit the westward spread of the flames.