E.C. Marchant, Commentary on Thucydides: Book 2 book 2, chapter 31, section 2 with the 3000 hoplites at Potidaea, the total becomes 13,000, as mentioned in c. Phormio, who had been sent with 1600 more to Potidaea, must have returned already to Athens, though, as often in Thuc., this fact is only referred to incidentally and later See c. 2. (13.66)