Philopoemen (19.3-19.4)

However, they carried Philopoemen into the Thesaurus, as it was called, a subterranean chamber which admitted neither air nor light from outside and had no door, but was closed by dragging a huge stone in front of it. Here they placed him, and after planting the stone against it, set a guard of armed men round about.

Him they put to flight; Meanwhile the horsemen of the Achaeans recovered themselves after their flight, and when Philopoemen was nowhere to be seen, but was thought to be dead, they stood for a long time calling aloud upon their leader and reproaching one another for having won an unlawful and shameful safety by abandoning to the enemy their general, who had been prodigal of his life for their sakes.