The P-47 was the first single-seated fighter to be equipped with a supercharger, allowing it to fly at the same high altitude as the bombers. This high-flying fighter was armed with eight 12.7mm machineguns that proved very useful in the intense fighting that occurred in the European skies. Equipped with drop tanks for longer range, the P-47D was then able to escort the bombers all the way to the German border. The Thunderbolt also allowed many Allied pilots to become Aces. Bomber crews plagued day after day by intensive German interceptions, would remark that the presence of the P-47 was of great help.