What about having a line of upgraded units standing in front of long-ranged units? This way, the enemy base could be destroyed at will while the opposing player can't take the formation out with anything less than a siege force like the Siege Tank- Marine-Medic combo in Starcraft. I know it's a *** way to win but I already brought the point up a few months ago

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Ctrl-alt-bingo! (Sarge)

If you join, prestongilstrap referred you ^^