Career
Nagler was a trained mechanic who joined aviation on 4 October 1913. He was in the reserves when World War I began. He served as a mechanic in FA 4 until 6 May 1915, when he reported for pilot training.
Upon graduation, he was stationed with FA(A) 220 on the Russian Front on 8 October.
He served with this unit until 27 September 1917. He then served with the fighter unit attached to FA(A) 220 until 10 December.
He was then transferred to Jasta Over-Ost. From there, he was forwarded on 26 March 1918 to Jasta 74.
When Jasta Over-Ost became Jasta 81, Nagler rejoined them.
Between 27 May and 5 October 1918, he ran up a score of nine Spads and a Breguet XIV shot down.