Festner crashed behind the British lines, between Gavrelle and Bailleul.
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Flying Albatros D.III (serial 2251/17), Festner was killed in action on 25 April 1917, near Oppy.
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A combat with No. 57 Squadron RFC Royal Aircraft Factory FE.2d's over Neuville on 2 April 1917 resulted in Festner claiming a FE-2d(Lt. H.P. Sworder KIA & 2/Lt. A.H. Margoliouth,POW).
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