They saw it, and so they marvelled; they were troubled, and hasted away. The sight of the city, with its walls and towers (Psalms 48:12, Psalms 48:13), was enough for them—they recognized that the place was too strong to be attacked with any prospect of success; "marvelled," or "were amazed" (Cheyne), at its strength, and, being troubled in mind, hasted away.
The unconnected verbs remind the commentators of Caesar's famous despatch, "Vent, vidi, vici."