Herbert Weir Smyth, A Greek Grammar for Colleges

πολλὰ πρά_γματα παρεῖχον οἱ βάρβαροι . . . ἐλαφροὶ γὰρ ἦσαν, ὥστε καὶ ἐγγύθεν φεύγοντες ἀποφεύγειν the barbarians caused great annoyance; for they were so nimble that they could escape even though they made off after they had approached quite near X. A. 4.2.27, ὁ ποταμὸς τοσοῦτος βάθος ὡς μηδὲ τὰ δόρατα ὑπερέχειν the river of such a depth that the spears could not even project above the surface 3. 5. 7 (on τοσοῦτος ὅσος etc. see 2003), ““τοσαύτην κραυγὴν . . . ἐποίησαν ὥστε . . . τοὺς ταξιάρχους ἐλθεῖν” they made such an uproar as to bring the taxiarchs” D. 54.5.

a. The idea of effecting may be unexpressed: (Κλέαρχος) ἤλαυνεν ἐπὶ τοὺς Μένωνος ὥστ᾽ ἐκείνους ἐκπεπλῆχθαι Clearchus advanced against the soldiers of Menon so (i.e. by so doing he brought it about) that they were thoroughly frightened X. A. 1.5.13; cp. 2267. Several verbs of effecting take ὥστε when the result is intended and where the simple infinitive is common (2267 b).