To these various military operations of Athens during the course of this summer, some other measures of moment are to be added; and Thucydidês also notices an eclipse of the sun which modern astronomical calculations refer to the third of August: had this eclipse happened three months earlier, immediately before the entrance of the Peloponnesians into Attica, it might probably have been construed as an unfavorable omen, and caused the postponement of the scheme. Expecting a prolonged struggle, the Athenians now made arrangements for placing Attica in a permanent state of defence, both by sea and land; what these arrangements were, we are not told in detail, but one of them was sufficiently remarkable to be named particularly. They set apart one thousand talents out of the treasure in the acropolis as an inviolable reserve, not to be touched except on the single contingency of a hostile naval force about to assail the city, with no other means at hand to defend it. They further enacted, that if any citizen should propose, or any magistrate put the question, in the public assembly, to make any different application of this reserve, he should be punishable with death. Moreover, they resolved every year to keep back one hundred of their best triremes, and trierarchs to command and equip them, for the same special necessity.[251] It may be doubted whether this latter provision was placed under the same stringent sanction, or observed with the same rigor, as that concerning the money, which latter was not departed from until the twentieth year of the war, after all the disasters of the Sicilian expedition, and on the terrible news of the revolt of Chios. It was on that occasion that the Athenians first repealed the sentence of capital punishment against the proposer of this forbidden change, and next appropriated the money to meet the then imminent peril of the commonwealth.[252] [251] Thucyd. ii, 24. [252] Thucyd. viii, 15.