Armature to empties?


I have a curve, along this curve three empties follow using ‘follow path’ constraints, the second is offset 10.0 behind and third offset at 20.0.

Next there is a three bone armature. I’m after this (say) being parented to the first empty, and then the next two bones following the next two empties.

How is something like this achieved?

Somehow worked with track to, sure I tried them before???