At daybreak the next morning the Norsemen were seen crowding into their ships. The trumpets sounded loudly, and the citizens seized their arms and hastened to the walls. The Norsemen crossed the river, and directed their attack against a tower which stood at the head of the bridge connecting the city and island with the farther bank. Those who landed were provided with picks, crowbars, and other implements for effecting a breach, and their approach was protected by a cloud of arrows and javelins from the fleet which covered the surface of the river. The French leaders soon assembled at the threatened point. Chief among these were Eudes, his brother Robert, the Count Ragenaire, and the Abbe Ebble, a nephew of the archbishop. The Franks bore themselves bravely, and in spite of the rain of arrows defended the walls against the desperate attacks of the Northmen. The fortifications in those days were very far from having attained the strength and solidity which a few generations later were bestowed upon them. The stones of which they were constructed were comparatively small, and fastened together by mortar, consequently they could ill resist even an assault by manual weapons. Covered by their shields the Northmen worked untiringly at the foundations, and piece by piece the walls crumbled to the ground. Every effort, however, to enter at the breaches so made was repulsed, and Siegfroi kept back his warriors, determined to delay the grand assault until the next day. By nightfall the tower was in ruins, scarce a portion of the walls remaining erect. Many of the besieged had been killed. The archbishop was wounded with an arrow. Frederic, a young soldier who led the troops of the church was killed. The besiegers had suffered much more severely, great numbers having been killed by the stones and missiles hurled down by the defenders while engaged in the demolition of the walls. At nightfall the Danes carried off their wounded and recrossed the river, confident that next day they would succeed in their assault. As soon as darkness had set in Count Eudes collected the citizens, and these, bearing beams and planks, crossed the bridge to the tower, and set to work. Outside the circle of ruins holes were dug and the beams securely fixed. Planks were nailed to these, and earth heaped up behind them. All night the work continued, and by morning a fortification much higher than the original tower had been erected all round the ruin. The Danes again crossed the river in their ships, and the assault was renewed. Javelins and great stones were hurled at the fortification, and clouds of arrows from the shipping fell within them. Covered with portable roofs constructed of planks the Danes strove to destroy the wall. The besieged poured upon them a blazing mixture of oil, wax, and pitch. Numbers of the Danes were burned to death, while others, maddened by the pain, threw themselves into the river.