In June, nine rank and file were present under Lieutenant-Colonel Burgoyne, R.E., at the siege of the fortified posts at Salamanca. Private James Durant was killed in the trenches on the night of the 17th June, and four privates were wounded. Thanks for their good conduct in the siege of the forts was conveyed to them in general orders.[189] ----- Footnote 189: ‘Wellington Dispatches,’ 1845, v., p. 724. ----- Eight of the corps were present in August at the capture of the Retiro at Madrid, and at the siege of Burgos in September and October. All were employed as overseers in the park and the trenches. Corporal M. Develin was killed, and the remaining seven were wounded. The whole party proved themselves to be good soldiers and skilful miners. Deriving their instruction, in great part, from the labours of previous sieges, they knew the best methods to achieve success. At Fort Christoval the want of experienced miners rendered it impracticable to crown the glacis and prevent the garrison removing the debris from the foot of the breach. At Burgos, on the contrary, though the assaults were frequent before the place fell, this handful of sappers, assisted by some miners from the guards, successfully worked up to the fortress, and formed effective breaches by mining, in the castle walls.[190] Private Patrick Burke, a distinguished stormer at Badajoz, was remarked for his usefulness and resolution in the explosion of a mine; and private Andrew Alexander for his valour in leading the workmen to crown the crater of a mine on the enemy’s glacis before the breach. The fifth company, second battalion, was sent in advance with stores for the siege but arrived too late to share in the operation. ----- Footnote 190: Jones’s ‘Sieges,’ notes by Colonel Harry D. Jones, i., p. 135, 377, 3rd edit. ----- In the retreat to the frontier of Portugal a few men of the corps mined the bridge at Alba on the Tormes, under Captain Goldfinch of the engineers. An eye-witness who observed their exertions says, “In crossing the bridge, we found the sappers hard at work mining and laying barrels of gunpowder to blow up the centre arch.”[191] The bridge was accordingly destroyed to check the advance of the enemy. This small party also assisted in the hasty intrenchments thrown up to defend the castle, and was present in repulsing the attack on the place. ----- Footnote 191: ‘United Service Journal,’ 2, 1829, p. 284, 285. ----- In January a corporal and nine privates were detached from La Isla to Carthagena to strengthen the fortifications there. Private Thomas Grewer was killed in springing a mine. The detachment returned to La Isla in April, 1814.