Frint was an Oberleutnant in Infantry Regiment No. 65 when the war began. While stationed on the Russian front, he was very badly wounded on 14 November 1914. Despite injuries that prevented him from returning to service with the infantry, he succeeded in transferring to the air service and was posted to Flik 23 after completing his training as an observer. Having scored six victories with this unit, Frint was killed during a test flight when the Albatros D.III (53.46) in which he was flying crashed in an orchard.
"A quiet, resolute, and clear-sighted man, inspired by the best sense of duty. An outstandingly capable officer, possessing unsurpassed bravery." Heinrich Kostrba