Passage 3.6.1
Ἀγησιπόλιδος δὲ ἄπαιδος τελευτήσαντος ἐς Κλεόμβροτον περιῆλθεν ἡ ἀρχή, καὶ ὑπὸ ἡγεμόνι τούτῳ Βοιωτοῖς ἐναντία ἠγωνίσαντο ἐν Λεύκτροις· Κλεόμβροτος δὲ αὐτὸς γενόμενος ἀνὴρ ἀγαθὸς ἀρχομένης ἔτι ἔπεσε τῆς μάχης. μάλιστα δέ πως ἐπὶ πταίσμασιν ἐθέλει μεγάλοις προαφαιρεῖσθαι τὸν ἡγεμόνα ὁ δαίμων, καθὰ δὴ καὶ Ἀθηναίων ἀπῆγεν Ἱπποκράτην τε τὸν Ἀρίφρονος στρατηγοῦντα ἐπὶ Δηλίῳ καὶ ὕστερον ἐν Θεσσαλίᾳ Λεωσθένην.
When Agesipolis died childless, the kingship passed on to Cleombrotus, and under his command they fought against the Boeotians at Leuctra. Cleombrotus himself, a good and courageous man, fell at the very onset of the battle. Indeed, it seems that divine power especially desires, in cases of great misfortune, to remove beforehand the leader from the action, just as previously it took away the Athenian general Hippocrates, son of Ariphron, at Delium, and later Leosthenes in Thessaly.