History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
On the return of the Peloponnesians from Attica, the Spartans themselves and the nearest of the Perioeci immediately went to the rescue of Pylus; but the other Lacedaemonians were more slow in marching against it, as they had but just reached home from a different expedition.