Assigned to the defense of the city of Belfort on the Franco/German border, it shot down 21 enemy planes while taking only two losses.

Founded in February 1917 with Nieuport fighters as Escadrille N.311, it was dissolved in June.

It was reformed in VI Armee on 25 July, still with Nieuports, as Escadrille N.315.

[1][2] It was designated Escadrille Spa.315 on 10 July 1918, signifying that it had been re-equipped with SPAD fighters.

On 26 October 1918, the Commanding General of VI Armee commended the squadron in official orders for its excellence in downing 21 German airplanes with the loss of only two French aircraft.