On the heights of Alexandria, the artificers with the column under Sir Ralph Abercrombie, superintended the erection of batteries and redoubts of sand-bags, fascines, and gabions, which formed a strong line of defence from the sea to Lake Maedie. The Aboukir party joining on the 20th, also assisted in the works until their completion. Unable, from being unarmed, to take an active part in the battle of Alexandria on the 21st March, they occupied themselves in the essential duty of carrying shot, shell, and ammunition to the artillery and the troops. After the battle the military artificers had the charge, under their officers, of renewing the works on the heights, and when completed were appointed to aid in effecting the inundation of a portion of the country. This was accomplished by cutting seven channels in the dyke of the canal of Alexandria, through which the waters of Lake Aboukir rushed into Lake Mareotis, then nearly dry, and about ten feet below the level of Lake Aboukir. Across the Nile they subsequently threw a bridge of boats, to facilitate the communication between Alexandria and Rosetta, re-forming it when swept away by the rapidity of the current; and afterwards they assisted in the construction of a similar bridge across the openings in the dyke of the canal of Alexandria for the convenience of the shipping. Four of the artificers who were at the siege of the castle of Aboukir were attached to the brigade under Colonel Spencer, and served at the reduction of Rosetta, Fort St. Julian—against which they constructed batteries for two guns and two mortars—Elhamet, Alkam, and Rahmanieh. Shortly after they proceeded to Grand Cairo and were present at its surrender on the 27th June. A brief interval elapsed, when they returned to Alexandria, by the river Nile, in the large which contained the field equipment of the detachment. On reaching Alexandria, the entire detachment was divided into two parties, one under Captain Bryce, the chief engineer, and the other under Captain Ford, royal engineers; and were subsequently present at the siege of the castle of Marabout, the taking of Redoubt de Bain, and at the final fall of Alexandria on the 27th August. No casualties in killed and wounded are reported to have taken place among the men during the campaign; and though no particular testimony to their merits appears to have been recorded, from the circumstance of their being so few in number, and from the absence of prominent occasions of exhibiting their zeal and efficiency, arising from the enemy capitulating and surrendering many of his works without resistance, still they were permitted in common with the other troops that served in Egypt, to wear the device of the Sphinx on their appointments. A like honour was also conferred upon the military artificers who served with the mission to Turkey.