close to Zaporizhia, signaling the beginning of the German counterattack, known to the German forces as the Donets Campaign. Comparison of forces Between 13 January and 3 April 1943, an estimated 210,000 Red Army soldiers took part in what was known as the Voronezh–Kharkov Offensive. In all, an estimated 6,100,000 Soviet soldiers were committed to the entire Eastern Front, with another 659,000 out of action with wounds. In comparison, the Germans could account for 2,988,000 personnel on the Eastern Front. As a result, the Red Army deployed around twice as many personnel as the Wehrmacht in early February. As a result of Soviet over-extension and the casualties they had taken during their offensive, at the beginning of Manstein's counterattack the Germans could achieve a tactical superiority in numbers, including the number of tanks present – for example, Manstein's 350 tanks outnumbered Soviet armor almost seven to one at the point of contact, and were far better supplied with fuel. German forces At the time of the counterattack, Manstein could count on the 4th Panzer Army, composed of XLVIII Panzer Corps, the SS Panzer Corps and the First Panzer Army, with the XL and LVII Panzer Corps. The XLVIII Panzer Corps was composed of the 6th, 11th and 17th Panzer Divisions, while the SS Panzer Corps was organized with the 1st SS, 2nd SS and 3rd SS Panzer Division. In early February, the combined strength of the SS Panzer Corps was an estimated 20,000 soldiers. The 4th Panzer Army and the First Panzer Army were situated south of the Red Army's bulge into German lines, with the First Panzer Army to the east of the 4th Panzer Army. The SS Panzer Corps was deployed along the northern edge of the bulge, on the northern front of Army Group South. The Germans were able to amass around 160,000 men against the 210,000 Red Army soldiers. The German Wehrmacht was understrength, especially after continuous operations between June 1942 and February 1943, to the point where Hitler appointed a committee made up of Field Marshal Wilhelm Keitel, Martin Bormann and Hans Lammers, to recruit 800,000 new able-bodied men – half of whom would come from "nonessential industries". The effects of this recruitment were not seen until around May 1943, when the German armed forces were at their highest strength since the beginning of the war, with 9.5 million personnel. By the start of 1943