It will be seen that Melas had so stationed his troops that he was weak at all points. Except at Genoa and along the Var, the Austrian army may be said to have been composed of a number of detachments scattered throughout northern Italy. Melas seemed to think that he must occupy every fortress, and guard every road and pass, in order to make secure his position in Italy. Herein lay his great fault; for, his forces being thus scattered, he could not unite them readily to oppose Bonaparte. Though Melas learned of the march of the Army of Reserve on Milan more than two weeks before the battle of Marengo, yet he was able to assemble only thirty-two thousand men at Alessandria to oppose the French. The main cause, however, of the defeat of Melas was the fact that he was completely deceived as to the intentions of the First Consul. He had no expectation that Bonaparte would cross the Alps; in fact, he did not believe in the existence of an army of reserve. Having reached this conclusion from the reports of his own spies, and from the instructions sent him by the Aulic Council, he was utterly confounded when the French descended into Italy from the Mont Cenis, the Great St. Bernard, the Simplon, and St. Gothard passes. Not knowing by which route the strongest column was entering Italy, he knew not where to strike. Consequently, he hesitated and was lost. Had he fathomed the designs of his adversary in time, he might have rapidly united his forces, and have defeated the several French columns in succession before they could have united in Italy; for, inasmuch as Bonaparte's object was to unite his columns within the Austrian theatre of operations, Melas could concentrate there more quickly than Bonaparte. On the 29th of May Melas learned of the march of the Army of Reserve on Milan. He then had a splendid opportunity to strike Bonaparte a telling blow. His command at Turin numbered sixteen or seventeen thousand men. In his front at Chivasso and along the Po was Lannes with six or seven thousand. On his left was Thurreau with four thousand. Had Melas left four or five thousand men to hold Thurreau in check, and boldly attacked Lannes with the remainder of his forces, he could easily have defeated Lannes, and have immediately thereafter obtained possession of Bonaparte's communications with France. Such a master stroke would have greatly embarrassed Bonaparte; for he would then have been obliged either to turn back and fight Melas, in order to recover his communications with France, or to push on and fight Vukassovich, in order to establish his communications with Switzerland. Had Bonaparte adopted the former course, Vukassovich could have closed in on the French rear and have thus aided Melas; had he adopted the latter course, Melas could have aided Vukassovich.