Book 1 covers the "Decelian War" period of the Peloponnesian War in the years 411–406 BC. The rival navies of Sparta and Athens fight campaigns in the Hellespont region. Initially, the Athenian navy saw several major sea victories. Book one also narrates restoration of Alcibiades to the Athenian military and his return to Athens in 407 BC. Book 2 narrates the years 406–402 BC and the end of the Peloponnesian War with the surrender of Athens in 404 BC. The Spartan commander Lysander ordered the long walls of Athens torn down, and Athens became formally allied with the Spartan hegemony. The Spartans also installed a new government. Book 2 focuses primarily on the internal politics of Athens following the war. The Spartan-instituted oligarch regime, known as the Thirty Tyrants' regime, was overthrown and there was a resumption of democracy in Athens. Book 3 shifts viewpoint from Athenian to Spartan politics, covering the years 401–395 BC. Book 3 starts with a brief account of the expedition of the Ten-thousand against the Persian king Artaxerxes II. For a further description of this, see Xenophon's Anabasis. Book 3 narrates the Spartan expedition led by King Agesilaus in Asia Minor against the Persians. The satraps of Ionia, Pharnabazus and Tissaphernes, are prominent characters with shifting allegiances throughout the Hellenica. Book 4 narrates events of 395–388 BC, and is primarily concerned with the Corinthian War. Book 4 recalls King Agesilaus' Ionian campaign against Persia of 396–395 BC. During this time, the satrap Pharnabazus bribed Greek states into revolting against Sparta. This eventually led to the Corinthian War, with the states of Athens, Corinth, Argos and Thebes united against Sparta. Agesilaus and his army were recalled in 394 BC from his campaign against Persia. This period saw the beginning of the Corinthian War, with the Persian Empire siding with Athens against Sparta. The Persian satrap Pharnabazus let the exiled Athenian general Conon lead the Persian navy in a number of battles, including the Battle of Cnidus in 394 BC. Conon then convinced Pharnabazus to allow Athens to keep the Persian fleet and to fund the rebuilding of the long walls at Athens. Book 5 covers the years 388–374 BC. There is a peace conference at the end of the Corinthian War in 387 BC that results in a treaty called the "King's Peace". The acropolis in Thebes is seized by the supposed renegade Spartan Phoebidas, enabling