Then they invested the walls of Plataea with
a large force, and made overtures to the Plataeans on terms that, if they would
surrender their city to the Lacedaemonians, they should retain their land and
enjoy their property, but that they should break off their alliance with the
Athenians. The Plataeans refused this offer and made answer that they would do
nothing without the Athenians, whereupon the Lacedaemonians besieged them for
two years, built a double wall about their city, and made repeated assaults of
every conceivable sort.