last left Athens, the year was 411 B.C., and the city was in desperate straits. The Spartans had seized the fortress of Deceleia only a few miles from the city, so that all the population took refuge within the city walls and farming came to an end. The nearby island of Euboea had revolted and removed another major source of food. All of which meant that all of Athens' food had to be imported from overseas. Most of it was grown around the Black Sea, which made control of access to that sea vitally important to the beleaguered city.
To recap, the Spartans had slipped by the Athenians in the Aegean and gotten into the Propontis, where they were setting off revolts that threatened Athens' food supply, its ability to continue the war, and quite possibly its survival. The Athenians had set up their base in Sestos on the northern shore and the Spartans at Abdyos on the southern shore.
Among the oligarchs was Theramenes. But he belonged to the moderate wing, who wished a broader, looser oligarchy, under the general rule of law and became alarmed when the hardliners appeared ready to commit treason to maintain their power. It was he who rallied the Athenians against the oligarchy at home and overthrew it. While in the fleet, Thrasybulus, a ship captain, was promoted to admiral and joined forces with Alcibiades to rally the fleet against the oligarchy. While Alcibiades gathered his forces in the southern Aegean, Thrasybulus sailed the bulk of the fleet into the Hellespont and won the Battle of Cynossema. It was there that Thucydides ends, and there that I found a convenient break as well.