and supported by artillery and the Luftwaffe. In doing so he sought to maintain the armoured strength of his panzer divisions to be used for exploitation once the Red Army defences were breached. Once a breakthrough had been achieved the panzer forces would move through and advance towards Kursk. Jan Möschen, a major in Model's staff, later commented that Model expected a breakthrough on the second day. If a breakthrough did occur the briefest delay in bringing up the panzer divisions would give the Red Army time to react. His corps commanders thought a breakthrough extremely unlikely. Following a preliminary bombardment and Red Army counter bombardments, the 9th Army opened its attack at 05:30 on 5 July. Nine infantry divisions and one panzer division, with attached assault guns, heavy tanks and tank destroyers, pushed forward. Two companies of Tiger tanks were attached to the 6th Infantry Division and were the largest single grouping of Tigers employed that day. Opposing them were the 13th and 70th Armies of the Central Front. The 20th Panzer and 6th Infantry Divisions of the XLVII Panzer Corps spearheaded the advance. Behind them the remaining two panzer divisions followed, ready to exploit any breakthrough. The heavily mined terrain and fortified positions of the 15th Rifle Division slowed the advance. By 08:00 safe lanes had been cleared through the minefield. That morning information obtained from prisoner interrogation identified a weakness at the boundary of the 15th and 81st Rifle Divisions caused by the German preliminary bombardment. The Tigers were redeployed and struck towards this area. Red Army formations countered with a force of around 90 T-34s. In the resulting three-hour battle, Red Army armoured units lost 42 tanks while the Germans lost two Tigers and a further five more immobilized with track damage. While the Red Army counter-attack was defeated and the first defensive belt breached, the fighting had delayed the Germans long enough for the rest of 29th Rifle Corps of the 13th Army – initially deployed behind the first belt – to move forward and seal the breach. Red Army minefields were covered by artillery fire, making efforts to clear paths through the fields difficult and costly. Goliath and Borgward IV remote-controlled engineer mine-clearing vehicles met with limited success. Of the 653rd Heavy Panzerjäger Battalion's 45 Ferdinands sent into battle, all but 12 of them were immobilized by mine damage before 17:00. Most of these