On 30 March 1915, it re-equipped with Morane-Saulnier L aircraft, becoming "Escadrille MS 15". In September 1915, it traded machines again, gaining Nieuport 11s and being renamed "Escadrille N 15". The "escadrille" was then consolidated into an ad hoc "Groupe de Chasse" along with "Escadrille F 16" and "Escadrille N 57". Under the command of Capitaine Paul de Peuty, this "groupe" was committed to the Third Battle of Artois. On 24 October 1915, the "groupe" was cited for its performance.