Seeing Duryodhana's brothers, who came to help him, slain one after another in this manner, Karna was overwhelmed by anguish. He leant back on his seat in the chariot and closed his eyes unable to bear the sight. Then recovering control over his emotions he hardened his heart and began again his attack on Bhima. Bow after bow was broken up by Bhimasena's shaft, but Karna kept the battle. Eighteen times he had to take up a fresh bow. Karna had long ago discarded his smile and his face showed savage anger even as Bhima's. They now glared fiercely at each other as they fought. Yudhishthira now heard Bhima's roar rise above the tumult of battle, and heartened by it, he fought Drona with increased vigor. In the renewed and fierce battle between Bhima and Karna, Bhima lost his horses and charioteer. Soon his chariot also was smashed to pieces. Then, Bhima hurled his spear at Karna who was in his chariot and as Karna parried it with his shaft, Bhima advanced with sword and shield. But Karna broke the shield at once with his shafts. Then, Bhima whirled his sword and hurled it, and it cut Karna's bow into two and fell on the ground. But Karna took up yet another bow and assailed Bhima with arrows more fiercely than before. Bhima, in a fit of uncontrollable rage, sprang upon Karna. Radheya took cover behind his flagstaff and escaped destruction. Thereupon, Bhima jumped out of Karna's car down into the field of battle where, deprived of all arms, he used the elephants lying dead on the ground to protect himself from Karna's arrows and continued the fight. He picked up anything he could lay hands upon, wheels of broken chariots, the limbs of horses and elephants that were lying about, and hurling them at Karna, kept him engaged without interval. But this could not long continue and Bhima was soon at a great disadvantage. Karna said exultingly: "Foolish glutton, you do not know the science of war; why do you engage yourself in battle here? Go to the jungle and fill yourself with fruits and roots and grow fat. You are a savage, not fit for kshatriya battle. Get away!" Hurling insulting taunts at him, he made the helpless Bhima burn with rage, but mindful of his word to Kunti, refrained from killing him. "There, Arjuna! See how poor Bhima is being harassed by Karna," said Krishna. Dhananjaya's eyes burned red with wrath, when he saw the plight of his valiant brother.He bent his Gandiva bow and discharged his arrows on Karna who then gladly turned his attentions from Bhima to Arjuna. He had pledged his word to Kunti not to kill more than one of the Pandavas and he reserved that option for the great Arjuna.