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.