I'm have a few embarrassingly basic questions about this passage:
οἱ δὲ ἐπειδὴ ἐν ταῖς ἀρχαῖς ἐγένοντο καὶ ἐξέτασιν ὅπλων ἐποιήσαντο, διαστήσαντες τοὺς λόχους ἐξελέξαντο τῶν τε ἐχθρῶν καὶ οἳ ἐδόκουν μάλιστα ξυμπρᾶξαι τὰ πρὸς τοὺς Ἀθηναίους ἄνδρας ὡς ἑκατόν, καὶ τούτων πέρι ἀναγκάσαντες τὸν δῆμον ψῆφον φανερὰν διενεγκεῖν, ὡς κατεγνώσθησαν, ἔκτειναν, καὶ ἐς ὀλιγαρχίαν τὰ μάλιστα κατέστησαν τὴν πόλιν.
1) What is the substantive that goes with οἱ?
2) What is τε doing?
3) What is καὶ doing here before a relative pronoun?
4) What is the substantive for τὰ? Is it ὡς ἑκατόν--"the about 100"? If so, why neuter?!
5) Does the last ὡς just mean "when"?
6) ἐς ὀλιγαρχίαν τὰ μάλιστα has got me confused. What is going on here?
Thanks in advance.

