The winter reduced military action to minor skirmishing and the spring thaw halted all military engagements, but during this lull, the city magnates hired the German mercenary captain Hans Winckelbruch von Kölln, who, in April, marched out to engage the Polish army at Lubieszów, near Tczew. The Polish army consisted of 1000 infantry (primarily Hungarians and Wallachians) and 1,300 cavalry, while Winckelbruch's force was made up of 3,100 landsknechts, 400 mercenary reiter cavalry, 400 city cavalry, and 6,000–8,000 militiamen, in total 10–12,000 soldiers. He also brought 7 cannon and 30 light cannon mounted on wagons. On hearing of Winckelbruch's advance, hetman Zborowski marched all but 100 infantry out of Tczew to attack the Gdańsk army, crossing the Motława River (a tributary of the Vistula then swollen with the spring thaw) at Rokitki, while Winckelbruch sent a force of 200 to delay the Commonwealth army as he tried to flank it and cross the Motława between two lakes to the south of the town of Lubieszów itself, west south west of Rokitki. While scouts informed Zborowski of the flanking move, two standards of cavalry he sent out to stop them were unable to stop Winckelbruch's crossing. Upon hearing of the failure to dislodge Winckelbruch from his left flank, Zborowski ordered the bridge at Roktiki destroyed and sent all of his forces to the west to engage Winckelbruch at the lakes. The battle started in earnest with Polish-Hungarian Infantry advancing, crouching at first to avoid withering enemy fire, to capture a battery of Gdańsk artillery, which was then turned to fire on the Danzig army. Winckelbruch ordered the landsknechts to attack with pikes, but they were repelled by the king's infantry who charged them with sabers. The landsknechts held their ground before the enemy infantry but finally broke when another two companies of Polish hussars attacked them in the flank. With this, the entire Danzig army broke and fled, and the Polish cavalry kept up the chase right to the Danzig city gates. Danzig's losses amounted to 4,400 dead and 5,000 taken prisoner, while the king's army suffered 188 casualties, only 88 of them deaths.