Military activity around the area increased significantly following the first Japanese air-raids on Darwin on 19 February 1942. The immediate aftermath of these attacks led to a mass-exodus of the city's civilian population toward the south, an event that would become known as the Adelaide River Stakes. The allied response was a significant increase of forces to rebuild and greatly expand defences in the region. A military airfield was built in the town close to the railway station, along with several others in the surrounding district including Coomalie Creek and Pell. In addition an artillery and weapons range was established at Tortilla Flats, between Coomalie Creek and Adelaide River. The town became an important tactical supply and communications base for all branches of the armed forces. In August 1942, the Adelaide River War Cemetery was established.