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
Capture of the City
How fearfully these mighty agencies had laboured in the work of destruction during the interval while Hasdrubal continued to vaunt and to gormandize, appeared so soon as the Roman army proceeded in the spring of 608 to attack the inner town. Hasdrubal gave orders to set fire to the outer harbour and made himself ready to repel the expected assault on the Cothon; but Laelius succeeded in scaling the wall, hardly longer defended by the famished garrison, at a point farther up and thus penetrated into the inner harbour. The city was captured, but the struggle was still by no means at an end.
The assailants occupied the market-place contiguous to the small harbour, and slowly pushed their way along the three narrow streets leading from this to the citadel--slowly, for the huge houses of six stories in height had to be taken one by one; on the roofs or on beams laid over the street the soldiers penetrated from one of these fortress-like buildings to that which was adjoining or opposite, and cut down whatever they encountered there. Thus six days elapsed, terrible for the inhabitants of the city and full of difficulty and danger also for the assailants; at length they arrived in front of the steep citadel-rock, whither Hasdrubal and the force still surviving had retreated.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=62