Total Annihilation - Kingdoms - The Iron Plague

Hints:
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Build a Smithy as soon as possible, and crank out a few 
Mechanics right away. Use them to build an Academy, and 
then build a couple of Chief Engineers. Then start 
building fighting units.

Use a Chief Engineer to build Mana Amplifiers as soon as 
possible. They're much more efficient at mana extraction 
than Refineries.

Don't bother with Gatling Crossbows; they're slow and weak. 
Prismatic Mirrors are infinitely more effective defensive 
turrets. Build them in rows of three or four for an incredibly 
strong defense.

Automations are incredibly slow melee units. Stay away from 
them and use Tortoises, Shock Troopers, and Beast Riders for 
ground assaults.