Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Everything was made subservient to ostentation, even wounds, which were often subsequently enlarged for the purpose of boasting a broader scar. Usually they fought on foot, but certain tribes on horseback, in which case every freeman was followed by two attendants likewise mounted; war-chariots were early in use, as they were among the Libyans and the Greeks in the earliest times. Various traits remind us of the chivalry of the Middle Ages; particularly the custom of single combat, which was foreign to the Greeks and Romans.
Not only were they accustomed during war to challenge a single enemy to fight, after having previously insulted him by words and gestures; during peace also they fought with each other in splendid suits of armour, as for life or death. After such feats carousals followed as a matter of course. In this way they led, whether under their own or a foreign banner, a restless soldier-life; they were dispersed from Ireland and Spain to Asia Minor, constantly occupied in fighting and so-called feats of heroism. But all their enterprises melted away like snow in spring; and nowhere did they create a great state or develop a distinctive culture of their own.
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Reference address : https://www.ellopos.net/elpenor/rome/2-04-fall-etruscan-celts.asp?pg=12