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The victory of the French troops under the command of the general Kléber over the Turkish army of the Grand Vizier Youssef Pasha at the Battle of Heliopolis on March 20, 1800, was the greatest triumph of the French arms during the Egyptian campaign of 1798-1801. However, of all the battles of that campaign it has been the least studied by historians and was practically forgotten in French historical memory. The author of article analyzes the reasons for this situation and presents the most detailed ever reconstruction of the course of the Battle of Heliopolis made on the basis of documents of the French military archives in Vincennes and on the memoirs of participants in these events.