At this moment some traitors deserting the camp of Ottocar, repaired to the camp of Rhodolph and proposed to assassinate the Bohemian king.  Rhodolph spurned the infamous offer, and embraced the opportunity of seeking terms of reconciliation by apprising Ottocar of his danger.  But the king, confident in his own strength, and despising the weakness of Rhodolph, deemed the story a fabrication and refused to listen to any overtures.  Without delay he drew up his army in the form of a crescent, so as almost to envelop the feeble band before him, and made a simultaneous attack upon the center and upon both flanks.  A terrific battle ensued, in which one party fought, animated by undoubting confidence, and the other impelled by despair.  The strife was long and bloody.  The tide of victory repeatedly ebbed and flowed.  Ottocar had offered a large reward to any of his followers who would bring to him Rhodolph, dead or alive.

A number of knights of great strength and bravery, confederated to achieve this feat.  It was a point of honor to be effected at every hazard.  Disregarding all the other perils of the battle, they watched their opportunity, and then in a united swoop, on their steel-clad chargers, fell upon the emperor.  His feeble guard was instantly cut down.  Rhodolph was a man of herculean power, and he fought like a lion at bay.  One after another of his assailants he struck from his horse, when a Thuringian knight, of almost fabulous stature and strength, thrust his spear through the horse of the emperor, and both steed and rider fell to the ground.  Rhodolph, encumbered by his heavy coat of mail, and entangled in the housings of his saddle, was unable to rise.  He crouched upon the ground, holding his helmet over him, while saber strokes and pike thrusts rang upon cuirass and buckler like blows upon an anvil.  A corps of reserve spurred to his aid, and the emperor was rescued, and the bold assailants who had penetrated the very center of his army were slain.

The tide of victory now set strongly in favor of Rhodolph, for “the race is not always to the swift, nor the battle to the strong.”  The troops of Bohemia were soon everywhere put to rout.  The ground was covered with the dead.  Ottocar, astounded at his discomfiture, and perhaps fearing the tongue of his wife more than the sabers of his foes, turned his back upon his flying army, and spurred his horse into the thickest of his pursuers.  He was soon dismounted and slain.  Fourteen thousand of his troops perished on that disastrous day.  The body of Ottocar, mutilated with seventeen wounds, was carried to Vienna, and, after being exposed to the people, was buried with regal honors.