Command & Conquer: Red Alert 2 Tips

Un breakable defence
To make this defence, you'll need to have lots of ore, or tech oil derricks. For the unbreakable defence, build a ring of prism/tesla towers around your base. Make it so that your units can still slip through. Also make many grand cannons, to take out any prism tanks trying to out range your prism towers. If your oponent trys to bomb you, than build 1 or 2 patriot missle systems behind your prism towers to shoot at those pesky harriers. with this defence, your prism towers should be able to take out a construction yard easily. With this defence, you dont need to worry about anyone attacking your base.