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.
The good wishes of men made greatly for the Lacedaemonians, especially as they gave out that they were the liberators of Greece. And every individual, as well as state put forth his strength to help them in whatever he could, both by word and deed,; and each thought that the cause was impeded at that point at which he himself would not be present. So angry were the generality with the Athenians;
some from a wish to be released from their dominion, others from a fear of being brought under it. With such preparations and feelings then did they enter on the contest.
Each party had the following states in alliance when they set to the war. The allies of the Lacedaemonians were these:
all the Peloponnesians within the Isthmus, except the Argives and Achaeans (these were in friendship with both parties; and the Pellenians were the only people of the Achaeans that joined in the war at first, though afterwards all of them did); and without the Peloponnese, the Megareans, Locrians, Boeotians, Phocians, Ambraciots, Leucadians, and Anactorians.
Of these, the states which furnished a navy were the Corinthians, Megareans, Sicyonians, Pellenians, Eleans, Ambraciots, and Leucadians. Those that supplied cavalry were the Boeotians, Phocians, and Locrians. The rest of them sent infantry. This then was the Lacedaemonian confederacy.