Answer:
The battle was a long drawn out attempt to capture the city of Syracuse in Sicily during the PeloponneseWar 431-404 BCE.
Alcibiades was recalled to Athens to face a charge of treason Summer 415 BCE.
Lamachus was killed trying to breach the Syracusan defenses Summer 414 BCE.
Nicias was executed after he was captured on surrender of the Athenian forces Summer 413 BCE.
Demosthenes was executed after he was captured on surrender of the Athenian forces Summer 413 BCE.