Towards the Great Horde he was both respectful and recalcitrant. He repulsed the invasions of adventurers into his territory; avoided the payment of tribute by sending costly presents regularly. But in 1478, when Khan Akhmet sent envoys with his image to receive tribute, Ivan openly rebelled; put all the messengers to death, save one; trampled the image of the Khan under foot, spat on the edict, and allowed this news to reach the Khan. When the enraged Tartars advanced towards Moscow, Ivan wished to remain in the city, but the inhabitants would have no shirking. "What! he has overtaxed us, refused to pay tribute to the Horde, and now that he has enraged the Khan, though he does not want to fight, he must--and shall." Ivan journeyed about from one town to another, returning to Moscow on various pretexts. He wished to consult the clergy, the boyards, his mother, anybody. The answer was always the same, "March against the enemy!" Forced to go South, he wished to send his son back to Moscow, but the young Ivan disobeyed. Archbishop Vassian urged Ivan to go to the front. "Is it part of mortals to fear death? We cannot escape destiny; a good shepherd will, at need, lay down his life for his flock." But this prompting did not suffice. Vassian at last lost patience, wrote a bellicose letter to Ivan, recounting the deeds of his heroic ancestors, from Igor Sviatoslaf to Dmitri Donskoi. Ivan assured him that this letter "filled his heart with joy, himself with courage and strength"; but another fortnight passed, and Ivan had not advanced a step. When at last the two armies came within sight of each other, the streams Oogra and Oka separated them. They insulted each other bravely across the water, but not daring to ford, waited until the river should be frozen. When this happened, Ivan at once gave orders for his forces to withdraw. Seeing the army in motion an inexplicable panic seized the Tartars, and they hastened away. Both armies were in flight, and no one pursuing. In such pitiful fashion did the Mongol supremacy terminate. For more than three centuries Moscow had acknowledged the rule of the Golden Horde, now a thoroughly demoralised rabble. The remnants in their flight south were opposed by the Nogay and Krim Tartars, and defeated. The Khan Akhmet was then put to death by his own men. Ivan next sent his voievodes or "war-leaders" against Kazan; in 1487 they took it and made Alegam, its commander, a prisoner. In his boyhood Ivan had been imprisoned in Kazan by his Tartar enemies, and so now was able to turn the tables on them completely.