While the Roman legions in the East were acquiring wealth and winning easy conquests, their less fortunate comrades in the West were carrying on a severe struggle with the warlike Gauls, Ligurians, and Spaniards. The Romans had hardly concluded the Second Punic War when they received intelligence that Hamilcar, a Carthaginian officer, had excited several tribes in Northern Italy to take up arms against Rome. These were the Gauls on both sides of the Po, and the Ligurians, a race of hardy mountaineers, inhabiting the upper Apennines and the Maritime Alps. They commenced the war in B.C. 200 by the capture and destruction of the Roman colony of Placentia, and by laying siege to that of Cremona, the two strong-holds of the Roman dominion in Northern Italy. The Romans now set themselves to work, with the characteristic stubbornness of their nation, to subdue thoroughly these tribes. The Insubres and the Cenomani, to the north of the Po, were the first to yield; but the Boii resisted for some years all the efforts of the Romans, and it was not till B.C. 191 that the Consul P. Cornelius Scipio Nasica received their final submission. He slaughtered the Boii without mercy, and made it one of the claims of his triumph that he had left only children and old men alive. This warlike people was now thoroughly subdued, and from henceforth Cisalpine Gaul became a Roman province, and gradually adopted the language and customs of Rome. The submission of the people was secured by the foundation of new colonies and the formation of military roads. In B.C. 190 a colony was established at Bononia, now Bologna, in the country of the Boii, and six years afterward others were also founded at Mutina (Modena) and Parma. A military road made by M. AEmilius Lepidus, Consul for B.C. 180, and called the Via AEmilia, was a continuation of the Via Flaminia, and ran from Ariminum past Placentia, Mutina, and Parma to Placentia. The subjugation of the Ligurians was a longer and more difficult task. These hardy mountaineers continued the war, with intermissions, for a period of eighty years. The Romans, after penetrating into the heart of Liguria, were seldom able to effect more than to compel the enemy to disperse, and take refuge in their villages and castles, of which the latter were mountain fastnesses, in which they were generally able to defy their pursuers. But into the details of these long-protracted and inglorious hostilities it is unnecessary to enter.