Whithersoever they went out, i.e. whatsoever expedition or business they undertook; which is usually signified by going out and coming in.
Related Commentaries of Judges 2:15
Judges 2:15
15 Whithersoever they went out, the hand of the LORD was against them for evil, as the LORD had said, and as the LORD had sworn unto them: and they were greatly distressed.