Albert Barnes Commentary Acts 20:13

"But we going before to the ship set sail for Assos, there intending to take in Paul: for so had he appointed, intending himself to go by land." — Acts 20:13 (ASV)

Sailed to Assos. There were several cities of this name. One was in Lycia; one in the territory of Eolis; one in Mysia; one in Lydia; and another in Epirus.

The latter is the one intended here. It was between Troas and Mitylene. The distance to it from Troas by sea was much greater than by land, and accordingly Paul chose to go to it on foot.

Minding himself. Choosing or preferring to go on foot (in the King James Version, afoot; that is, “intending to go by land”). Most of his journeys were probably performed in this way.