On March 1, 1815, Napoleon landed at Golfe Juan. On March 3 in Gap, news of the landing was known and the arrival of the Emperor was announced for March 5. In the Hautes-Alpes prefecture, there are three witnesses to these events, Pierre-Antoine Farnaud the general secretary, François Merlet, the secretary of the prefect Harmand and Joseph Faure head of the general administration office. All three have written their memoirs and give us their perceptions of these days of March 1815. To their points of view are added the writings of Alexandre César Flour de Saint-Genis, mayor of Upaix, of Albert Montemont, administrator of Rights gathered in Gap, Guillaume Joseph Peyrusse, general treasurer of the Crown during the Hundred Days, Jean-Baptiste Germain Fabry lawyer and writer, Louis Olivier, grenadier. A Gapençais historian, Ernest Sibour, also provides his perspective through the testimonies he has collected. Some are royalists, others are Bonapartists but all relate in great detail what happened on March 5 and 6, 1815 in the Hautes-Alpes. But, they do not forget to mention the consequences of Napoleon's passage through Gap with the punitive operations carried out by the Marseille royalists on this city, operations which only had their outcome on April 7, 1815 during the Battle of Piles à La Saulce. Throughout these documents, the reader will be able to make their own analysis of this Hundred Days period.