I just read a half page article on the last page of the March 2003 issue of Aviation History on this fight. Here's what it said.
"85 YEARS AGO THIS MONTH
Gengoult aerodrome, France, April 14, 1918-First Lietenant Douglas Campbell
and 2nd Lt. Alan Winslow were in the right place at the right time when two German aircraft were spotted at 9:40 a.m. near Toul, France. They promptly jumped into their nearby Nieuport 28s-newly embellished with the "Hat in the Ring" insignia of the U.S. Army Air Service (USAS) 94th Squadron-and took off in pursuit of the enemy planes.
Within minutes, the two American pilots had shot down both aircraft, an Albatros D.Va flown by German Staff Sgt. Heinrich Simon and a Pfalz D.IIIa piloted by Polish Sgt. Maj. Antoni Wroniecki. Those victories went into the history books as the first scored by USAS pilots. Campbell, who had trained with the USAS and seen no previous combat, was acclaimed as the first American-trained airman to down as enemy plane (Winslow had previously served in French Escadrille Spa. 152, as a volunteer of the Lafayyette Flying Corps).
Military History Magazine author Tomasz Goworek notes that after both enemy pilots were taken into custody, one of them-officially identified as the Polish pilot Wroniecki-died of injuries sustained in combat and his subsequent crash. In reality, Goworek says, there is ample evidence to suggest that it was the German pilot who died. The names of the downed pilots were deliberately interchanged in the official records to protect Wroniecki. Anxious to escape forced service to the kaiser, the Pole had been shot down while he was trying to escape to the French lines. On explaining to the French and American authorities that he wanted to defect, Wroniecki was declared dead so that he could avoid charges of treason if he was subsequently recaptured by the Germans. The Polish aviator then joined the French air service under an assumed name, Wroblewski."
Hope this helps. Seems like the last paragragh adds some additional info to whats been posted.