|Part of Eastern Front|
| Soviet Union
|Commanders and leaders|
|Marius Senseman|| Konstantin Serebryannikov
|Army Group Odessa||Odessa Front|
|1,500,000 troops||2,000,000 troops
|Casualties and losses|
The Red Army's Odessa Front advanced from Odessa, which was liberated on April 10, and they planned out an attack on the German, Romanian, and Bulgarian defensive position near the border with Romania. The Soviets, led by Konstantin Serebryannikov, were escorted by the 1st Odessan Tank Army and 2nd Odessan Tank Army, who punched holes in the German lines. The 600th Panzer Division was obliterated, as was the Austrian 1st Army, in a series of tank and infantry actions. Serebryannikov had not one plane in the sky, yet achieved great progress against the Axis forces. Army Group Odessa's armies held their line at Reni thru Kiliya, but their towns and villages blocking the path were being liberated quickly. The Romanian Resistance had a hand in helping the Soviet troops, with Fabek Walesa's partisan group of 5,000 troops supporting their advance. The Romanians ambushed German supply convoys, leaving Army Group Odessa in trouble. Marius Senseman, the commander of Army Group Odessa, ordered for there to be no surrender after hearing of the massacre of Axis prisoners in various places.
The Allies split up on April 21: the Romanians would secure Giurgiulesti, a border town in the Romanian Province of Moldova, while the Odessa Front's two armies, the First Odessa Army and the Second Odessa Army, split up; the First Odessa army pushed south of Giurgiulesti and attacked the stronghold of Grindu in Romania, while the Second Odessa Army took on Chilia Veche, about 25 kilometres (17.5 miles) from the Black Sea coastline. The partisans took over the town without much opposition, and advanced farther than planned. The First Odessa Army encountered heavy resistance from German and Romanian troops led by Stanislaus Eckert, commander of the XVII Regiment, but 1,000 Romanian partisans attacked Grindu from the west, taking it over. The Second Odessa Army were able to take Chilia Veche, defeating an Axis landing force of Bulgarian troops, shipped out from Golden Sands, Bulgaria. 5,000 Bulgarians were killed, wounded, or captured.
The offensive was declared over on April 27, after the Russians and partisans pushed to Galati. The offensive ended, with the drive on Bucharest halting until Operation Bagration, the great offensive in the north.