Epaminondas leads the forces of Boeotia, Euboea, and Thessaly on a march into the Peloponnese. (Xenophon, Hellenica 7.5.4)
At Nemea the Athenian army waits to pass through; when it learns Athens has changed to a sea route, it camps at Tegea. (Xenophon, Hellenica 7.5.6–7.5.7)
Epaminondas makes a night march and surprises Sparta, but a Cretan informs Agesilaus, and the defense succeeds. (Xenophon, Hellenica 7.5.9–7.5.10)
Epaminondas, learning in Sparta that Arcadian reinforcements have arrived, turns back and marches to Tegea. (Xenophon, Hellenica 7.5.14)
Athenian cavalry from Eleusis fights the Theban cavalry outside the walls of Mantinea, protecting property outside the city. (Xenophon, Hellenica 7.5.15)
On the plain of Mantinea, Epaminondas deploys his lines, then feigns laying down arms at the foot of the mountain, and charges in the shape of a trireme's ram. He himself falls, but the outcome of the battle remains unclear. (Xenophon, Hellenica 7.5.21–7.5.25)
After the battle neither side gained territory, cities, or power, and Greece became more confused than before. (Xenophon, Hellenica 7.5.26–7.5.27)