Following the war, he resumed his studies after his family's return, graduating from the Jelgava Agricultural High School, then working for several years at the Vidsmuiža Livestock Research Station.
He entered the Latvian Military Academy in 1928, graduating in 1931, and was then deployed to join the 7th Sigulda Infantry Regiment stationed in Aluksne.
Hāzners and several other prisoners managed to escape on 30 June[6] as the Soviets began their retreat ahead of the German capture of Rīga the following day.
Regiment was forced to retreat from positions in Opochka along the banks of the Velikaya River; the battalion was reorganized as part of the Kārlis Aperāts battle group.
On 18 July 1944, battalion commander Lieutenant Colonel Aperāts was mortally wounded in battle near the town of Mozulyu and handed his command over to Hāzners, who with the five dozen or so surviving soldiers and officers he now led managed to cross a swamp and break out from the Russian forces surrounding them.
On 26 January 1945, Hāzners was wounded in action at Mrocza (Immenheim) and sent to Denmark for recovery, where he remained until the end of the war.
[1] Following the war, Hāzners was housed with other Latvian POWs at the Zedelgem prisoner-of-war camp in Belgium, where he was one of the founders of the Daugavas Vanagi welfare organization.
[9] Hāzners was acquitted after neither the Immigration and Naturalization Service nor the Office of Special Investigation (OSI) were able to provide evidence.