Bohemian national hero, regarded as one of the greatest military commanders in history. In the early winter of 1421 AD, when the Hussite commander Zizka's army was fighting the second Crusade, it was premeditated and surrounded by the army of Holy Roman Empire on the snowy and windy Upper Sázava, and fell into imminent destruction. However, Zizka created the Wagenburg tactics in a desperate situation and led the Hussite coalition to reverse the situation of the battle. He added fortifications to the tanks equipped with artillery, forming a mobile turret fortress with both offensive and defensive capabilities, and launched a charge towards the enemy's lines. The artillery violently bombarded the infantry phalanx, while the musketeers hiding behind the fortifications shot the cavalry. Such perfect tactical coordination left the army of Holy Roman Empire without any resistance, and the entire army fled in rout. After several hours of fierce fighting, this most difficult battle in winter ended in a heavy artillery barrage. Under Zizka's outstanding command, the Bohemians once