The French themselves had given the first warning during the siege under Count Lally; for, although they were powerless against the Fort, they were able to enter Black Town without opposition, and they made use of some of the houses for the purpose of the siege. The next warning was given a few years later when Tipu, the son of Haidar Ali, Sultan of Mysore, after ravaging the country round Madras, came so near to the city itself that parties of his horsemen were scampering about in the suburb of Chintadripet. Tipu's raid induced the Company to bring forth the approved but long-shelved plans for a wall round Black Town; but there was still much more discussion than work. The Company needed yet another awakening; and they got a stern one two years later. We quote the story from the Company's official records, published by the Madras Government. It is contained in a minute in the official Diary of Fort St. George, dated the 29th of March, 1769, which runs as follows:-- About 8 o'Clock this morning several Parties of the Enemy's (Haidar Ali's) horse appeared in the Bounds of this Place at St. Thome and Egmore, from which latter place some guns were fired at them.... At eleven o'Clock a fellow was caught plundering at Triplicane and brought into Town, who gave Intelligence that Hyder himself was on the other side of St. Thome with the greatest part of his horse. In the afternoon Advice came that the Enemy's horse were moving from St. Thome round to the Northward with a design, as was supposed, to make an attempt on the Black Town. It would have been difficult to have defended the unwalled town; and on the following day the Council of Fort St. George sent Mr. DuPre, Chief Councillor and succeeding Governor, to Haidar Ali's camp, on the other side of the Marmalong Bridge, to come to terms with the invader; and within three days a treaty had been made. The treaty, said Mr. DuPre, writing to a friend, "will do us no honor: yet it was necessary, and there was no alternative but that or worse." After this humiliation the building of the Wall was regarded as a pressing necessity; and within a year the work was practically finished. [Illustration: 'THE OLD AND THE NEW' Corner of the Medical School built into a portion of the Black Town Wall.]