Thirteen years after Coronea came the Battle of Leuctra. There were 700 Spartiates participating, including 300 in the king’s guard. The entire guard was wiped out along with 100 other Spartiates. At Leuctra, the ratio of Spartiates to non-Spartiates was one to five. Hardly a demonstration of the power of the agoge.
One might ask why more Periokoi were not used to bring up the strength of the Spartan army at various points There are two answers to that question. In the first place the Periokoi were the citizens of a hundred small towns in the Spartan territory and did not have a large supply of men over the whole time period. Secondly, the Spartans had to include a minimum number of their own hoplites to insure the they were fielding a “Spartan” army that would make the best trained hoplites available.