Three days later, Prince Stefan Piast took up positions blocking a second army from crossing a ford. There was significant foliage on the river-banks in which he hid his cannon and arquebusiers. The blocking force consisted of pike-men behind a temporary earthwork. Duke Stanislaus Jagiellon, the Catholic commander, decided to force the ford, using his vastly superior forces to smash through this unsupported local regiment. He thought of his youthful son, Casimir, so foully struck down in the Mazovia massacre, and his sight grew dim with wrath. He longed to slaughter the heartless peasants who had murdered his boy and mangled his body. Against the advice of his subordinates, he refused to use artillery first, but sent his swordsmen across, closely supported by cavalry in a second wave. The swordsmen found the footing of the ford very uneven where the Lutherans had undermined it. When the whole regiment was in the river, the Lutheran cannon and arquebusiers raked them with devastating fire. Men fell in the river and were swept away by the strong current. Others stumbled on to be struck down at the rampart. Over half of the regiment died in the assault before withdrawing into the cavalry. Then the Lutherans fired again devastating both units and causing panic among the infantry. They fled willy-nilly while the cavalry milled around in the ford trying to gain their footing and control over their panicked mounts. A third volley and a fourth choked the ford with dead and dying while the brave survivors perished against the rampart. Duke Stanislaus wept in fury and ordered more men forward, but they would not advance into that hail of death. He rode into the mutinying troops striking left and right with his sword against these traitors. A dozen fell dead or wounded before a maddened peasant struck at him from behind with a pike causing his horse to rear in agony. In its pain, it threw him and then fell atop him. The peasant, scion of a long line of brutalised and exploited serfs, thrust his pike through the Duke’s hateful Patrician throat, cutting off its curses. Leaderless, the second army retreated in confusion even as Piast’s cannon continued to fire.