The Spartans (documentary) the Spartan constitution into the militarised state we know of today. Homosexuality among men and boys was mandatory. The training of Spartan youths is explained, from their enrollment in the Agoge system right through to their attainment of citizenship. The class structure of the Lacedaemonian state (Helots, Perioeci, and the soldier-citizens themselves) is also covered. The episode ends with the battle of Thermopylae, in which 300 Spartans, including their king, Leonidas, were killed in action defending Greece from a Persian invasion. Part 2 opens with the retreat of the Persians, after Thermopylae and the battle of Salamis. Athens, which had
Battle of Thermopylae he selected only Spartans with living sons. The Spartan force was reinforced "en route" to Thermopylae by contingents from various cities and numbered more than 7,000 by the time it arrived at the pass. Leonidas chose to camp at, and defend, the "middle gate", the narrowest part of the pass of Thermopylae, where the Phocians had built a defensive wall some time before. News also reached Leonidas, from the nearby city of Trachis, that there was a mountain track that could be used to outflank the pass of Thermopylae. Leonidas stationed 1,000 Phocians on the heights to prevent such a