It is true that when Agis the Spartan was active in revolt Demosthenes once more made a feeble effort in his support, but then he cowered down, since the Athenians would not join in the uprising. Agis fell in battle, and the Lacedaemonians were crushed.
Edition :
Plutarch Lives VII: Demosthenes and Cicero, Alexander and Caesar, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 99), Harvard University Press: Cambridge/MA - London 1967 (first ed. 1919).
