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
Retreat to Carrhae
Of course the Romans did not wait for the morning. The lieutenant- generals Cassius and Octavius--Crassus himself had completely lost his judgment--ordered the men still capable of marching to set out immediately and with the utmost silence (while the whole-- said to amount to 4000--of the wounded and stragglers were left), with the view of seeking protection within the walls of Carrhae. The fact that the Parthians, when they returned on the following day, applied themselves first of all to seek out and massacre the scattered Romans left behind, and the further fact that the garrison and inhabitants of Carrhae, early informed of the disaster by fugitives, had marched forth in all haste to meet the beaten army, saved the remnants of it from what seemed inevitable destruction.
Departure from Carrhae - Surprise at Sinnaca
The squadrons of Parthian horsemen could not think of undertaking a siege of Carrhae. But the Romans soon voluntarily departed, whether compelled by want of provisions, or in consequence of the desponding precipitation of their commander-in-chief, whom the soldiers had vainly attempted to remove from the command and to replace by Cassius. They moved in the direction of the Armenian mountains; marching by night and resting by day Octavius with a band of 5000 men reached the fortress of Sinnaca, which was only a day's march distant from the heights that would give shelter, and liberated even at the peril of his own life the commander-in-chief, whom the guide had led astray and given up to the enemy.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=12