Lexitechnia

A short one — Livy, Ab Urbe Condita 24.1:

Itaque Regio extemplo abscessum est.

And so they left Reggio immediately.

There are two cities in Italy called Reggio, or R(h)egium in Latin: Reggio nell’Emilia in the north and Reggio di Calabria in the south, at the toe of the Italian boot.  The latter is the one being referred to here, as the Carthaginians had to leave due to the approach of Roman ships crossing the strait from Messina (Latin Messana) in Sicily.

[For abscedo.]