At 16:50, with the Prussian southern attacks stalling, the Prussian 3rd Guards Infantry Brigade of the Second Army opened an attack against the French positions at St. Privat, which were commanded by Marshal Canrobert. At 17:15, the Prussian 4th Guards Infantry Brigade joined the advance followed at 17:45 by the Prussian 1st Guards Infantry Brigade. All of the Prussian Guard attacks were pinned down on the slopes by lethal French gunfire. At 18:00 King William ordered a renewed advance. At 18:15 the Prussian 2nd Guards Infantry Brigade, the last of the 1st Guards Infantry Division, was committed to the attack on St. Privat, while Steinmetz ordered the last unit in the reserves of the First Army across the Mance Ravine. By 18:30, a considerable portion of the VII and VIII Corps panicked and disengaged from the fighting without attaining their objective and withdrew towards the Prussian positions at Rezonville.