To the astonishment of the Austrians, he crossed most of his army of 150,000 men during the night of July 4, and on July 6 fought the dreadful battle of Wagram. About 300,000 were in the battle. Fifty thousand on both sides were killed and wounded, probably about an equal number in each army. The weather was extremely hot, and the corn on the battle-field caught fire from the shells. "The movements of both armies were hampered by the necessity of avoiding it," says Marbot; "for if once troops were overtaken by it, pouches and wagons exploded, carrying destruction through the ranks.... Of the soldiers who were severely wounded, great numbers perished in the flames; and of those whom the fire did not reach, many lay for days hidden by the tall corn, living during that time on the ears. The Emperor had the plains searched by bands of cavalry, and vehicles were brought from Vienna to remove the wounded, friends and foes alike. But few of those even whom the fire had passed recovered, and the soldiers had a saying that straw-fire had killed nearly as many as gun-fire." "After the battle," says General Savary, "the Emperor sent sixty francs in crown pieces to each wounded soldier, and more than this to each officer." Oct. 14, 1809, the peace of Vienna was signed at Schönbrunn, between France and Austria. "I committed a great fault after the battle of Wagram," said Napoleon at St. Helena, "in not reducing the power of Austria still more. She remained too strong for our safety, and to her we must attribute our ruin." On Napoleon's return to France he had made up his mind to an act which will always tarnish his fame, and from which the decadence of his empire may be dated. He would divorce Josephine, and marry another, with the hope that he might have an heir to the throne. Undoubtedly he believed he was doing the best thing for France; and Thiers says the French people, while they loved Josephine, wished for the divorce. On Nov. 30, 1809, as he and Josephine were dining together at Fontainebleau, not a word having been uttered except Napoleon asked one of the servants what time it was, he communicated to her his decision. After dismissing the servants, he came to her, took her hand, pressed it to his heart, and said, "Josephine! my dear Josephine! You know how I have loved you.... To you, to you alone, I owe the only moments of happiness I have tasted in this world. But, Josephine, my destiny is not to be controlled by my will. My dearest affections must yield to the interests of France." "I expected this," said poor Josephine, "but the blow is none the less mortal." She became at once insensible; and Napoleon, alarmed, hastily called assistance and bore her to her room. He came to see her in the evening, and wept. Eugène determined at once to resign his position as Viceroy of Italy, but his mother begged him to remain the friend of Napoleon.