nam postquam exercitui praeesse coeperat , neque terra neque mari hostes pares esse potuerant .
for after army:DAT command:INF start:3SG and.not land:ABL and.not sea:ABL enemy:NOM equal:NOM be:INF can:3PL
And after he (Alcibiades) started to be the army commander, the enemies could not compete, neither by land nor by sea.