replacement aircraft meant the Red Army and VVS formations would be able to conduct an extended campaign without slackening in the intensity of their effort. Opposing forces Germans For the operation, the Germans used four armies along with a large portion of their total tank strength on the Eastern Front. On 1 July, the 9th Army of Army Group Centre based in the northern side of the salient contained 335,000 men (223,000 combat soldiers); in the south, the 4th Panzer Army and Army Detachment "Kempf", of Army Group South, had 223,907 men (149,271 combat soldiers) and 100,000–108,000 men (66,000 combat soldiers) respectively. The 2nd Army, that held the western side of the salient contained an estimated 110,000. In total, the German forces had a total strength of 777,000–779,000 men, and the three attacking armies contained 438,271 combat soldiers. Army Group South was equipped with more armoured vehicles, infantry and artillery than the 9th Army of Army Group Center. The 4th Panzer Army and Army Detachment "Kempf" had 1,377 tanks and assault guns, while the 9th Army possessed 988 tanks and assault guns. German industry produced 2,816 tanks and self-propelled guns between April and June, of which 156 were Tigers and 484 Panthers. At Kursk, a total of 259 Panther tanks, about 211 Tigers, and 90 Ferdinands were used. The two new Panther battalions – the 51st and 52nd – together equipped with 200 Panthers, for which the offensive had been delayed, were attached to the Großdeutschland Division in the XLVIII Panzer Corps of Army Group South. With the 51st and 52nd Battalions arriving on 30 June and 1 July, the two units had little time to perform reconnaissance or to orient themselves to the terrain they found themselves in. This was a breach of the methods of the Panzerwaffe, considered essential for the successful use of armour. Though led by experienced panzer commanders, many of the tank crews were new recruits and had little time to become familiar with their new tanks, let alone train together to function as a unit. The two battalions came direct from the training ground and lacked combat experience. In addition, the requirement to maintain radio silence until the start of the attack meant that the Panther units had little training in battalion-level radio procedures. Furthermore, the new Panthers were still experiencing problems with their transmissions, and proved mechanically unreliable. By the morning of 5