Hey Stealth. When you have multiple of the same unit selected and you're trying to issue orders in the setup, if you hit 'tab' on your keyboard you will cycle through the units selected and can give orders to them individually. It might make it easier than selecting one, telling them to go someplace, then going back to select the other unit with your mouse and then going to the other place you want to send them.
That left side was wide open; basically a red carpet into their base. Pair that with the excellent defense in the middle and you have a textbook case of flank and maneuver.