In the morning the Northmen, boarding their ships, approached the tower and attacked it.[230] They shook it with their engines and stormed it with arrows. The city resounded with clamor, the people were aroused, the bridges trembled. All came together to defend the tower. There Odo, his brother Robert,[231] and the Count Ragenar distinguished themselves for bravery; likewise the courageous Abbot Ebolus,[232] the nephew of the bishop. A keen arrow wounded the prelate, while at his side the young warrior Frederick was struck by a sword. Frederick died, but the old man, thanks to God, survived. There perished many Franks; after receiving wounds they were lavish of life. At last the enemy withdrew, carrying off their dead. The evening came. The tower had been sorely tried, but its foundations were still solid, as were also the narrow _baies_ which surmounted them. The people spent the night repairing it with boards. By the next day, on the old citadel had been erected a new tower of wood, a half higher than the former one. At sunrise the Danes caught their first glimpse of it. Once more the latter engaged with the Christians in violent combat. On every side arrows sped and blood flowed. With the arrows mingled the stones hurled by slings and war-machines; the air was filled with them. The tower which had been built during the night groaned under the strokes of the darts, the city shook with the struggle, the people ran hither and thither, the bells jangled. The warriors rushed together to defend the tottering tower and to repel the fierce assault. Among these warriors two, a count and an abbot [Ebolus], surpassed all the rest in courage. The former was the redoubtable Odo who never experienced defeat and who continually revived the spirits of the worn-out defenders. He ran along the ramparts and hurled back the enemy. On those who were secreting themselves so as to undermine the tower he poured oil, wax, and pitch, which, being mixed and heated, burned the Danes and tore off their scalps. Some of them died; others threw themselves into the river to escape the awful substance....[233] Meanwhile Paris was suffering not only from the sword outside but also from a pestilence within which brought death to many noble men. Within the walls there was not ground in which to bury the dead.... Odo, the future king, was sent to Charles, emperor of the Franks,[234] to implore help for the stricken city. [Sidenote: Odo's mission to Emperor Charles the Fat]