Transferred to Flik 42J in October 1917, he flew fighters in the Battle of Caporetto. He scored his second victory on 27 October 1917, flying an Aviatik D.I. Thereafter, he flew an Albatros D.III. Often he flew with two other winners of the Gold Medal for Bravery, aces Ferdinand Udvardy and Johann Risztics. Hefty would stake a combat claim on 17 April 1918, followed by seven more in June 1918. While Hefty garnered five credited victories, five more went unconfirmed.
