As the fuel capacity of a Nieuport allows but little more than two hours in the air the _avions de chasse_ were forced to return to their own lines to take on more gasoline, while the bombardment planes continued on into Germany. The Sopwiths arrived first at Oberndorf. Dropping low over the Mauser works they discharged their bombs and headed homeward. All arrived, save one, whose pilot lost his way and came to earth in Switzerland. When the big machines got to Oberndorf they saw only flames and smoke where once the rifle factory stood. They unloaded their explosives on the burning mass. The Nieuports having refilled their tanks went up to clear the air of Germans that might be hovering in wait for the returning raiders. Prince found one and promptly shot it down. Lufbery came upon three. He drove for one, making it drop below the others, then forcing a second to descend, attacked the one remaining above. The combat was short and at the end of it the German tumbled to earth. This made the fifth enemy machine which was officially credited to Lufbery. When a pilot has accounted for five Boches he is mentioned by name in the official communication, and is spoken of as an "Ace," which in French aërial slang means a super-pilot. Papers are allowed to call an "ace" by name, print his picture and give him a write-up. The successful aviator becomes a national hero. When Lufbery worked into this category the French papers made him a head liner. The American "Ace," with his string of medals, then came in for the ennuis of a matinee idol. The choicest bit in the collection was a letter from Wallingford, Conn., his home town, thanking him for putting it on the map.