He stood out in August 1917 during the Third Battle of Oituz, when he commanded a machine-gun detachment in the assault on Tarapan Hill, and was later wounded in action; for his valor, he was decorated with the Order of Michael the Brave, 3rd class.

Subsequently he was chief of staff of the 12th Division and then of the General Inspectorate of the Cavalry, after which he was promoted in 1939 to the rank of colonel and given the command of the 8th Roșiori Regiment.

[5] The start of Operation Barbarossa on 22 June 1941 found Colonel Korne in command of the 6th Motorized Roșiori Regiment from the 5th Cavalry Brigade, which was stationed in Northern Moldavia.

On 25 September, at the start of the Battle of the Sea of Azov, the 5th Cavalry Brigade faced the powerful Soviet offensive carried out by the 9th and 18th Armies, being attacked by a much superior force in the Yakymivka area.

Breaching the Isthmus of Perekop on 28 October 1941, his regiment moved towards Simferopol, cut the retreat roads to Yevpatoria, and then took part in the siege of Sevastopol and the Battle of the Kerch Peninsula.

Korne's units fought at Feodosia and on the road to Kerch alongside the German troops of Colonel Karl-Albrecht von Groddeck.

[8] Starting in August 1942 Korne fought in the Battle of the Caucasus, reaching Anapa at the end of the month, and then Novorossiysk, which fell to Wehrmacht and Romanian Army units at the beginning of September.

In January 1943, Korne was promoted to the rank of brigadier general,[9] and was appointed commander of the 8th Cavalry Division (succeeding Colonel Corneliu Carp).

[11]: 62  While many Romanian units disintegrated under this attack, with thousands surrendering without a fight, Korne's division confronted head on the onslaught of the Red Army.

[15][16] On November 16, he wrote a letter to Prime Minister Constantin Sănătescu, where he deplored the fact that so many of the Romanian senior officer corps were being dismissed en masse, while others were being arrested or harassed, after having fought in war as ordered by the king.

[15][6] There, he was severely beaten[19] on orders from the prison commandant, Nicolae Moromete, and was left with a broken spine, according to historian Radu Ciuceanu.