Chief Vincent Dunn, the most prolific author in the fire service, has returned to the FDNY. In his latest book, Chief Dunn declares firefighting is a war and buildings the Firefighter’s battlespace. Chief Dunn says a battlespace is the total fire environment, the inside and outside of a burning building. A battlespace is not just the room and fire, it includes much more. Chief Dunn also tells us about firefighting “game changers” in this book. A “game changer” is notification of an event, construction feature or fire growth that changes an incident commander’s thinking or strategy.