"All our allies have risen against us"
"Until the Spartans come in arms, and slew many Thessatiousmen, and many allies and friends of Hippie"
"Who we opposed that day at famed Thermopylae"
"If it were needed, threatened by barbarian foes" - implies they are ready to fight again, and the fear of a Persian invasion.
HELOTS AND PEROIKOI
"Then who will we be able to arouse to revolt?" - reference…