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
Alexander made his appearance in the Persian empire as a conqueror; Pyrrhus appeared in Italy as the general of a coalition of secondary states. Alexander left his hereditary dominions completely secured by the unconditional subjection of Greece, and by the strong army that remained behind under Antipater; Pyrrhus had no security for the integrity of his native dominions but the word of a doubtful neighbour.
In the case of both conquerors, if their plans should be crowned with success, their native country would necessarily cease to be the centre of their new empire; but it was far more practicable to transfer the seat of the Macedonian military monarchy to Babylon than to found a soldier-dynasty in Tarentum or Syracuse. The democracy of the Greek republics--perpetual agony though it was--could not be at all coerced into the stiff forms of a military state; Philip had good reason for not incorporating the Greek republics with his empire.
In the east no national resistance was to be expected; ruling and subject races had long lived there side by side, and a change of despot was a matter of indifference or even of satisfaction to the mass of the population. In the west the Romans, the Samnites, the Carthaginians, might be vanquished; but no conqueror could have transformed the Italians into Egyptian fellahs, or rendered the Roman farmers tributaries of Greek barons.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=5