After much debate in the Athenian Assembly, the decision was made to send a force to Sicily under the command of three generals: Nicias, Alcibiades, and Lamachus. Nicias was reluctant to command the mission, while Alcibiades (nephew of Pericles) was young, charismatic, and all for battle. Lamachus was chosen because he could offer an experienced point of view that would, hopefully, keep the expedition on course.
Things started badly. Just after the army’s departure, Alcibiades was accused of plotting to deface statues of the god Hermes in Athens, and asked to return. Instead he fled to Sparta and joined the Peloponnesean side. Nicias, still reluctant, wasted the first campaign season deciding how to attack Syracuse. He contented himself with building a wall around the city. Then, at the beginning of 414 the Syracusans sent their own envoys to Sparta asking for help. Alcibiades urged the Spartans to defend Syracuse, but they used caution and only sent four ships with no infantry.