On 22 February 1944, Fifteenth Air Force made its first attack on Germany, with an attack on Regensburg. The Fifteenth dispatched a force of 183 bombers to the Oberstraubing Messerschmidt assembly plant. Some 118 bombed with good results but fourteen were shot down. The next day the 15th sent 102 bombers to the Steyr ball-bearing works in Austria where they destroyed twenty percent of the plant. On 24 February, over 180 Liberators inflicted considerable damage to the Messerschmitt Bf 110 assembly plant at Gotha, losing 28 aircraft in the process. On 25 February 114 B-17s and B-24s were dispatched to Steyr again, but the force became separated and the Liberators bombed the Fiume oil refinery instead. Seventeen bombers were lost.