This mission is entitled Alpha 10: "Counterattack" in the Warzone 2100 Guide - Walkthrough Here's a direct quote from the Guide:
"At Base A, organize your units into groups. If you hustle, you can build a Sensor Tower on the ridge west of point 2."
I'm still trying to figure out the location of "Point 2"!
Tips for Alpha 10
Re: Tips for Alpha 10
Try the New Warzone Guide thread. It has newer and more detailed walkthroughs.