By this time, Grabovenko was a gunner in the division's 691st Artillery Regiment. He was awarded the Medal "For Courage" on 14 August. On 25 September, his battery was involved in fighting near Grebeni village in Kaharlyk Raion. On 28 September, Grabovenko helped repulse 3 German counterattacks against  the Dnieper bridgehead for 10 hours. During the fighting, he was wounded but reportedly did not leave the guns. Despite the German troops sometimes being as close as 60 to 100 meters to the guns, Grabovenko reportedly continued to fight and killed numerous German soldiers. Grabovenko fired the guns until he ran out of shells, then fought with his personal weapon. He was wounded, but reportedly did not leave the frontline. For his actions, Grabovenko was awarded the title Hero of the Soviet Union and the Order of Lenin on 24 December. In 1944, he joined the  Communist Party of the Soviet Union.
By this time, Grabovenko was a gunner in the division's 691st Artillery Regiment. He was awarded the Medal "For Courage" on 14 August. On 25 September, his battery was involved in fighting near Grebeni village in Kaharlyk Raion. On 28 September, Grabovenko helped repulse 3 German counterattacks against the Dnieper bridgehead for 10 hours. During the fighting, he was wounded but reportedly did not leave the guns. Despite the German troops sometimes being as close as 60 to 100 meters to the guns, Grabovenko reportedly continued to fight and killed numerous German soldiers. Grabovenko fired the guns until he ran out of shells, then fought with his personal weapon. He was wounded, but reportedly did not leave the frontline. For his actions, Grabovenko was awarded the title it of the Soviet Union and the Order of Lenin on 24 December. In 1944, he joined the Communist Party of the Soviet Union.