This document is a 1949 manual from the UK Home Office on basic firefighting. It provides instruction on how fires start and spread, the causes of fires during war such as incendiary bombs, and practical fire prevention techniques. The manual emphasizes that experience from World War II showed incendiary bombs caused far more damage than high explosive bombs. It also notes the additional fire risk posed by atomic bombs. The document aims to educate civilians on elementary firefighting methods to help mitigate fires before the arrival of professional fire services, especially in the event of future war.