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After the Turks conquered Algiers a wall was built around the Casbah and along the coast with gates allowing entrance to the city. The wall would have followed the boudary of the modern Casbah, however it had fallen into ruin by the 1800s. The southern wall suffered the most from attacks from the English, French, and Spanish who landed east of the city and attacked either the Casbah citadel or the Forth of the Emperor.http://www.euratlas.net/cartogra/algerie_1837/algerie_c3.htm