Many Polish pilots flew in other RAF squadrons, usually given nicknames because, as Ingersoll wrote, "the Polish names, of course, are unpronounceable". Later, further Polish squadrons were created: 304 (bomber, then Coastal Command), 305 (bomber), 306 (fighter), 307 (night fighter), 308 (fighter), 309 (reconnaissance, then fighter), 315 (fighter), 316 (fighter), 317 (fighter), 318 (fighter-reconnaissance) and 663 (air observation/artillery spotting). The fighter squadrons initially flew Hurricanes, then Supermarine Spitfires, and eventually some were equipped with North American Mustangs. Night fighters used by 307 were the Boulton-Paul Defiant, Bristol Beaufighter and the de Havilland Mosquito. The bomber squadrons were initially equipped with Fairey Battles and Vickers Wellingtons, then Avro Lancasters (300 sqn), Handley Page Halifaxs and Consolidated Liberators (301 sqn) and de Havilland Mosquitos and North American Mitchells (305 sqn). 663 flew Auster AOP Mk Vs.