The development of fire-induced wind and its action on wildfire behaviour are studied by numerical simulation of fire spread on sloping terrain. The simulations, conducted using a physics-based fire model, are based on a shrubland fire experiment carried out on a 28° sloping terrain under a 1.67 m/s wind-speed, resulting in a high-intensity fire (about 10 MW/m). Three lengths of the ignition line were considered: infinite fire line (simulated using periodic boundary conditions), 30-m-long fire line (as in the experiment), and 90-m-long fire line. Results show that fire-induced wind only occurs in the case of a large fire-front length and that its interaction with the fire front changes fire-spread regime. The highest intensity of fire-induced wind was obtained for an infinite fire front leading to a wind-driven fire with Byram's number less than 2. Induced wind was practically cancelled for a 30-m-long fire line as the fire draws fresh air into the flaming zone from the lateral sides, yielding a plume-dominated fire with Byram's number greater than 10. For a 90-m-long fire line, the intensity of fire-induced wind increased compared to the 30-m-long fire line case, resulting in a transitional fire-spread regime with Byram's number between 2 and 10.