Herbert Weir Smyth, A Greek Grammar for Colleges

““ὀκτὼ σταδίων τεῖχος” a wall eight stades long” T. 7.2, πέντε ἡμερῶν σι_τία provisions for five days 7. 43 (cp. fossa pedum quindecim, exilium decem annorum Less commonly with a neuter adjective or pronoun: ἐπὶ μέγα ἐχώρησαν δυνά<*> they advanced to a great pitch of power T. 1.118, τὶ δόξης some honour (aliq<*> famae) 1. 5, ἀμήχανον εὐδαιμονία_ς (something infinite in the way of happiness) infinite happiness P. A. 41c (with emphasis on the adj.). But the phrases εἰς τοῦτο, εἰς τοσοῦτο ἀφικέσθαι (ἤκειν, ἐλθεῖν, προσβαίνειν, usually with a personal subject) followed by the genitive of abstracts are common: ““εἰς τοῦτο θράσους ἀφί_κετο” he reached such a pitch of boldness” D. 21.194, ““ἐν παντὶ ἀθυ_μία_ς” in utter despondency” T. 7.55, ἐν τούτῳ παρασκευῆς in this stage of preparation 2. 17, κατὰ τοῦτο καιροῦ at that critical moment 7. 2. The article with this genitive is unusual in classical Greek: ““εἰς τοῦτο τῆς ἡλικία_ς” to this stage of life” L. 5.3. Some of these genitives may also be explained by 1306.