οἱ τότε ἤρχοντο εἰς τὴν νῆσον → they were then coming to the island
cŏ-addo: ĕre, v. a.,I to add with, add also, Cato, R. R. 40, 2; Plaut. Cas. 3, 1, 4.
cŏaddō,¹⁶ ĕre, tr., joindre à : Cato Agr. 40, 2.