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The primary target of Allied operations was Ploiești, the major site of Romania's oil industry. The largest refinery there—Astra Română—processed 2,000,000 short tons (1,800,000 t) of petroleum a year, providing much of the fuel for the German military.
Other attacks were against Bucharest, the country's capital.
The first airstrikes against Romania occurred after Romania joined the Third Reich in June 1941 during their invasion of the Soviet Union. In the following two months, Soviet Air Forces conducted several attacks against the King Carol I Bridge, destroying one of its spans and damaging an oil pipeline; see Zveno project. However, after the successful Axis powers' Crimean Campaign and overall deterioration of the Soviet position, Soviet attacks against Romania ceased.
The United States Army Air Forces (USAAF) first dropped bombs on Romania on 12 June 1942 during the HALPRO (Halverson project) raid against Ploiești (the first U.S. mission against a European target). Thirteen B-24 Liberator heavy bombers under the command of Col. Harry A. Halverson from Fayid, Egypt dropped eight bombs into the Black Sea, two onto Constanţa, six onto Ploieşti, six onto Teișani, and several onto Ciofliceni. In all, three people were killed and damage was minor.
The bombing of Ploiești on 1 August 1943 (Operation Tidal Wave) was a far more serious affair. Tidal Wave heavily damaged four refineries and more lightly affected three; it damaged the Ploiești rail station but did not have much impact on the city itself. Câmpina was more severely damaged. 660 American aircrew were killed or captured, while petroleum exports exceeded pre-Tidal Wave levels by October.
Anglo-American bombers first attacked Bucharest on 4 April 1944, aiming mainly to interrupt military transports from Romania to the Eastern Front. Lasting for two hours, the operation destroyed hundreds of buildings and killed or injured over 5,000 people according to unofficial statistics.
Following King Mihai I's 23 August coup against Antonescu, the Luftwaffe retaliated from 23–25 August, and destroyed several buildings in Bucharest until their base just north of the city in Otopeni was itself bombed by the USAAF and RAF.
- MARI DEZASTRE Bombardarea Bucureştilor în ’44, Adevărul, 22 February 2011. Retrieved 12 April 2016.