Being particularly uneasy in respect to the cities of Achaia, a country so distant from him, and also of Argos, even more, indeed, than of Corinth, he resolved, as the most advisable method, to put the former into the hands of Nabis, tyrant of Lacedaemon, in trust, as it were, on the terms, that if he should prove successful in the war, Nabis should re-deliver it to him; if any misfortune should happen, he should keep it himself.

Accordingly, he wrote to Philocles, who had the command in Corinth and Argos, to have a meeting with the tyrant.
Philocles, besides coming with a valuable present, added to that pledge of future friendship between the king and the tyrant, that it was Philip's wish to unite his daughters in marriage to the sons of Nabis.

The tyrant, at first, refused to receive the city on any other conditions than that of being invited to its protection by a decree of the Argives themselves: but afterwards, hearing that in a full assembly they had treated the name of the tyrant not only with scorn, but even with abhorrence, he thought he had now a sufficient excuse for plundering them, and he accordingly desired Philocles to give him possession of the place as soon as he pleased.

Nabis was admitted into the city in the night, without the privity of any of the inhabitants, and, at the first light, seized on the higher parts of it, and shut the gates.

A few of the principal people having made their escape, during the first confusion, the properties of all who were absent were seized as booty: those who were present were stripped of their gold and silver, and loaded with exorbitant contributions.