Hannibal Barca, the great Carthaginian general, did it in 218 BC. He managed to not only bring his soldiers through, but what at the time was the ultimate war weapon: elephants. Credited as saying “We will find a way, and if there is no way, we will make a way,” Hannibal left behind a bronze stele that stated he brought 20,000 infantry, 6,000 cavalry, and 37 elephants over the Alps when he arrived in Italy during the Second Punic War. Although pro-Roman writers including Polybius and Livy claimed that Hannibal lost half of his men while coming through Great Saint Bernard Pass, modern historians think otherwise. They suggest that a little as 500 men succumbed to the cold, the hazards of avalanches, and from attacks by local tribes. They also believe that the general passed through the Lesser Saint Bernard Pass, which is further to the west
Since the pass was too steep and rocky for wheeled vehicles, the artillery was dismantled at Bourg St. Pierre, the last settlement on the Swiss side of the pass. Chests, specially made in the nearby villages of Villeneuve and Orsires were packed with the ammunition and iron fittings and loaded on to mules. Teams of soldiers carried the disassembled caissons and the gun barrels. The Army began their passage on May 15. The passage took five days to reach the hospice at the top of the pass, where the prior, father Berenfaller, offered Napoleon a meal in the great reception hall while the monks distributed food to his troops.
On the other side of the St. Bernard Pass, the artillery was reassembled in the village of Etroubles then moved with the Army into the Aosta valley, where they had to lay siege to Fort de Bard, losing the element of surprise. Eventually, the French beat the Austrians at Marengo on June 14.