he impaired the efficiency of their navy
From LSJ
σκληρόν σοι πρὸς κέντρα λακτίζειν → it is hard for thee to kick against the pricks, it is hard for you to kick against the goads
English > Greek (Woodhouse Quotes)
τὴν ἀκμὴν τοῦ ναυτικοῦ αὐτῶν ἀφείλετο
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