Puzzle time!

[GreatGonzales]

I haven't read the answers above, but I think this would be a good move:

Move the two 3 hp soldiers to the immediate right of the yellow soldier nearest the base, so that both blue soldiers can strike the yellow soldier, and in doing so form a wall preventing easy access to corner of base. (2 wits)
Move 4 hp solder adjacent the top blue soldier in this formation, also adjacent the red runner. (1 wit)
Destroy yellow soldier nearest the base (2 wits)
Destroy red runner (1 wit)

Green should be able to help clean up, and blue can bring in the sniper to take out any 3 hp soldiers that come too close.