The last Tidal Wave attack bombed the Steaua Română refinery ( northwest of Ploiești)[REF] at Câmpina.
On their way over Bulgaria, the B-24s were intercepted by three fighter groups, 10 Bf 109s from Karlovo, four Avia B-534s from Bozhurishte and 10 Avia B-534s from Vrashdebna (Sofia) airport.