Madras, at the mouth of the Triplicane, consisted of the native or black city and of Fort S. George, which lay on the sea, and was almost engirdled by the North River that with the Triplicane formed an island crossed by the main road from Chinglapett and Vandalone. The French, whilst in possession of Fort S. George, after it had been taken by Labourdonnais in 1746, had made several improvements and additions to the slight works they found, which, nevertheless, rendered the fort little capable of long resistance against the regular approaches of a European enemy; nor had they given any attention to the internal area, which did not exceed fifteen acres of ground. Nevertheless, the English let the place remain in the same state after its recovery from the French in 1751 till the beginning of the year 1756, when the expectation of another war with that nation, and the reports of the great preparations making in France against India, dictated the necessity of rendering it completely defensible; and Call was employed in the extension and perfecting of the work, that had received the consideration of Robbins before his decease. Accordingly all the coolies, labourers, and tank diggers whom the adjacent country could supply were from this time constantly employed on the fortifications: their daily number generally amounted to four thousand men, women, and children. The river channel was diverted, and the old channel was filled up; very extensive bastions and outworks were erected; and it was due to this undertaking that Fort S. George was able to stand successfully against the siege by the Count de Lally in 1759. In the beginning of the year 1752 Call accompanied Captain (afterwards Lord) Clive in an expedition against the French, who had possessed themselves of the province of Arcot, and were plundering up to the very gates of Madras; and he was with him in his occupation and subsequent defence of Arcot, during a fifty days' siege. Clive had marched from Madras with two hundred English soldiers and three hundred sepoys. He had with him eight English officers, but of these only two had smelt powder, whilst four, Call among them, were only commercial clerks forced by Clive's example to draw the sword. The battle of Coverplank, near Arcot, gained by Captain Clive in the February of 1752, in which the French lost all their artillery and were totally dispersed, cleared the province of their influence and established the English in the garrison of that capital. From Arcot the victorious army, consisting of about five hundred Europeans and one thousand natives, marched through the country back to Fort S. David, when Mr. Call was appointed chief engineer at Madras, and eventually of all the Coromandel coast.