This treaty was made in the spring, just at the end of winter, directly after the city festival of Dionysus, just ten years, with the difference of a few days, from the first invasion of Attica and the commencement of this war. This must be calculated by the seasons rather than by trusting to the enumeration of the names of the several magistrates or offices of honor that are used to mark past events. Accuracy is impossible where an event may have occurred in the beginning, or middle, or at any period in their tenure of office. But by computing by summers and winters, the method adopted in this history, it will be found that, each of these amounting to half a year, there were ten summers and as many winters contained in this first war.