 Shortly after taking power, the extremist leaders of the revolution had begun constructing fortifications on Eetioneia, a dominant point in the entrance to the harbor of Piraeus, ostensibly to protect the harbor against an attack from the fleet at Samos.With internal dissent increasing, they joined these new fortifications to existing walls to form a redoubt defensible against attacks from land or sea, which contained a large warehouse into which the extremists moved most of the city's grain supply.Theramenes protested strongly against the building of this fortification, arguing that its purpose was not to keep the democrats out, but to be handed over to the Spartans; Thucydides testifies that his charges were not without substance, as the extremists were actually contemplating such an action.