Power Plant 3. The Shorter the Return Trip, The Better . Build each refinery as near as possible to an ore field. That way, your chrono miners won't need to make a long trip before they start to gather their next load of ore. These units should be built one immediately after the other.
Time is of the essence.
The quicker you can get your advanced army ready to roll, the more likely you will be in a position to attack without encountering your opponent's own massive army of advanced units. Waiting even 30 or 40 seconds to start one of these buildings can slow you down during the critical mid-point in the game where advanced armies begin to surface from the players' barracks and war factories. Just keep in mind that if you do this it will slow down your ability to mine credits for several more minutes. Assuming, however, that no defensive structures or Barracks units have been built at this point, we have now arrived at our first critical strategic decision point. The Moment of Truth You are now faced with a difficult dilemma.