From the two-acre base of the tower the Champ-de-Mars stretches inland to the Ecole Militaire (built 1769-72) and still used by the Ecole Supérieure de Guerre (War College), where the 15-year-old cadet Napoleon Bonaparte was enrolled in 1784. Originally the schools parade ground, the field was the scene of two vast revolutionary rallies, that of the Federation (1790) and that of the Supreme Being (1794). From 1798 there were annual national expositions of crafts and manufactures, followed by worlds fairs between 1855 and 1900. The International Exposition of 1937 spread around it, for between 1908 and 1928 the field had been made into a formal park.