(a) The Athenians and Peloponnesians began the war with the dissolution of the Thirty Years Peace.(b) But first I have given the grievances and disputes on account of which they dissolved the Peace, in order that no one may ever question from what origin so great a war came into being, for while (it is true that> the truest explanation was (another matter, namely> that the growing power of the Athenians alarmed the Spartans and compelled them to go to war, the openly avowed grievances as a result of which they dissolved the Peace and went to war were as follows on either side.