The besiegers of Hennebon were greatly discouraged at the success of the enterprise of the countess.

They had already attempted several desperate assaults, but had each time been repulsed with very heavy loss.

They now sent to Rennes for twelve of the immense machines used in battering walls, which had been left behind there on a false report of the weakness of Hennebon.

Pending the arrival of these, Charles of Blois, with one division of the army, marched away to attack Auray, leaving Don Louis to carry on the siege with a force considered amply sufficient to compel its surrender after the arrival of the battering machines.
In a few days these arrived and were speedily set to work, and immense masses of stone were hurled at the walls.
Walter continued to act as the countess's especial squire.

She had informed Sir William Caddoudal and Sir John Powis that it was at his suggestion that she had made the sudden attack upon the French camp, and he had gained great credit thereby.
The effect of the new machines was speedily visible.