Passage 10.19.8
ἔνθα δὴ ὁ Βρέννος πολὺς μὲν ἐν συλλόγοις τοῖς κοινοῖς, πολὺς δὲ καθʼ ἕκαστον ἦν τῶν ἐν τέλει Γαλατῶν ἐπὶ τὴν Ἑλλάδα ἐπαίρων στρατεύεσθαι, ἀσθένειάν τε Ἑλλήνων τὴν ἐν τῷ παρόντι διηγούμενος καὶ ὡς χρήματα πολλὰ μὲν ἐν τῷ κοινῷ, πλείονα δὲ ἐν ἱεροῖς τά τε ἀναθήματα καὶ ἄργυρος καὶ χρυσός ἐστιν ἐπίσημος· ἀνέπεισέ τε δὴ τοὺς Γαλάτας ἐλαύνειν ἐπὶ τὴν Ἑλλάδα, καὶ αὑτῷ συνάρχοντας ἄλλους τε προσείλετο τῶν ἐν τέλει καὶ τὸν Ἀκιχώριον.
Then indeed Brennus, both in the general assemblies and in private conversations with each of the Galatian chiefs, strongly urged a military expedition against Greece. He depicted the present weakness of the Greeks, and described the immense wealth belonging both to the community and even more stored up in sanctuaries, consisting of notable dedications as well as silver and gold. Thus he persuaded the Gauls to march upon Greece, and he selected as his co-commanders various other chiefs, among whom was Akichorius.