So the answer is yes, they can do the Vanguard move before the start of the movement phase and still shoot as long as they dont move in the movement phase. So deploy 12 inches away from your side, vanguard move 12 inches. You should be with 24 inchs of your target. Now blast them with 2 ranks of outriders. I plan one unit of 2x5 outriders for 30 STR 4 AP shots on turn one. Of course they will get the attention of something but they should do some nice damage before they go. At 239 points its not bad.