In the night of the 27th, about 3 o’clock, the French sallied against the new battery on the isthmus, but as colonel Cameron of the ninth regiment met them on the very edge of the trenches with the bayonet the attempt failed, yet it delayed the arming of the battery. At day-break the renewed fire of the besiegers, especially that from the Chofres sand-hills, was extremely heavy, and the shrapnel shells were supposed to be very destructive; nevertheless the practice with that missile was very uncertain, the bullets frequently flew amongst the guards in the parallel and one struck the field-officer. In the course of the day another sally was commenced, but the enemy being discovered and fired upon did not persist. The trenches were now furnished with banquettes and parapets as fast as the quantity of gabions and fascines would permit, yet the work was slow, because the Spanish authorities of Guipuscoa, like those in every other part of Spain, neglected to provide carts to convey the materials from the woods, and this hard labour was performed by the Portuguese soldiers. It would seem however an error not to have prepared all the materials of this nature during the blockade. Lord Wellington again visited the works this day, and in the night the advanced battery, which, at the desire of sir Richard Fletcher had been constructed for only four guns, was armed. The 29th it opened, but an accident had prevented the arrival of one gun, and the fire of the enemy soon dismounted another, so that only two instead of six guns as lord Wellington had designed, smote at short range the face of the demi-bastion of St. John and the end of the high curtain; however the general firing was severe both upon the castle and the town-works and great damage was done to the defences. By this time the French guns were nearly silenced and as additional mortars were mounted on the Chofre batteries, making in all sixty-three pieces of which twenty-nine threw shells or spherical case-shot, the superiority of the besiegers was established. The Urumea was now discovered to be fordable. Captain Alexander Macdonald of the artillery, without orders, waded across in the night passed close under the works to the breach and returned safely. Wherefore as a few minutes would suffice to bring the enemy into the Chofre batteries, to save the guns from being spiked their vents were covered with iron plates fastened by chains; and this was also done at the advanced battery on the isthmus. This day the materials and ordnance for a battery of six pieces, to take the defences of the Monte Orgullo in reverse, were sent to the island of Santa Clara; and several guns in the Chofre batteries were turned upon the retaining wall of the horn-work, in the hope of shaking down any mines the enemy might have prepared there, without destroying the wall itself which offered cover for the troops advancing to the assault.