German communications and supply lines. The attacks were mostly behind Army Group North and Army Group Centre. In June 1943, partisans operating in the occupied area behind Army Group Centre destroyed 298 locomotives, 1,222 railway wagons and 44 bridges, and in the Kursk sector there were 1,092 partisan attacks on railways. These attacks delayed the build-up of German supplies and equipment, and required the diversion of German troops to suppress the partisans, delaying their training for the offensive. Central Partisan Headquarters coordinated many of these attacks. In June Soviet Air Forces (VVS) flew over 800 sorties at night to resupply the partisan groups operating behind Army Group Centre. The VVS also provided communication and sometimes even daylight air-support for major partisan operations. Special training was provided to the Soviet infantry manning the defences to help them overcome the tank phobia that had been evident since the start of the German invasion. Soldiers were packed into trenches and tanks were driven overhead until all signs of fear were gone. This training exercise was referred to by the soldiers as "ironing". In combat, the soldiers would spring up in the midst of the attacking infantry to separate them from the spearheading armoured vehicles. The separated armoured vehicles – now vulnerable to infantry armed with anti-tank rifles, demolition charges and Molotov cocktails – could then be disabled or destroyed at point-blank range. These types of attacks were mostly effective against the Ferdinand tank destroyers, which lacked machine guns as secondary armament. The soldiers were also promised financial rewards for each tank destroyed, with the People's Commisariat of Defence providing a bounty of 1,000 roubles for each destroyed tank. The Soviets employed maskirovka (military deception) to mask defensive positions and troop dispositions and to conceal the movement of men and materiel. These included camouflaging gun emplacements, constructing dummy airfields and depots, generating false radio-traffic, and spreading rumours among the Soviet frontline troops and the civilian population in the German-held areas. Movement of forces and supplies to and from the salient took place at night only. Ammunition caches were carefully concealed to blend in with the landscape. Radio transmission was restricted and fires were forbidden. Command posts were hidden and motor transport in and around them forbidden. According to a Soviet General Staff report, 29 of the 35 major Luftwaffe raids on Soviet airfields in the Kursk sector in June 1943 were against dummy airfields.