thanks for the tips. 
  just got through it today.  
 I used fighters to kill all the ground troops along the path to veers. Moved up mobile artillery to the clearing, opened up with the. Advanced At-Pt's with a probe droid to let them see further, and blasted the base to bits. Then sent a single AT-St to get veers and to the landing site (using fighters to clear again). Then kept advancing my artillery with at-st's now to destroy the base. 
 ------------------
 Paul Barnard
 aka Bad Monkey
 Knight Watch Shipping Corporation (
http://members.xoom.com/paulbarnard/) 
 [Redacted]@[Redacted].[Redacted]