Red Alert Walkthrough: Soviet 12
This is the first 'find and capture the chronosphere' mission.
In 12, you start out in the northwest corner by an enemy base. Be VERY careful about keeping your forces alive ... especially the vehicles and most especially the rocket launcher. Don't move south, just pick off those things you have to. Focus all of your energy on one target at a time, and protect your rocket launcher. Build an ore refinery, and have the launcher pick off the remaining forces one by one, leaving the turret on the lower left. When it goes, the enemy gets help, so just leave it there.
Next, build a war factory so you can build a vehicle repair bay and fix your vehicles. Move south slowly, building up your forces.
The keys to victory are the same as every other mission; take out the enemy power source and keep the money rolling in. The four tech centers that you have to 'take over' are in two places - one is in the absolute SW corner of the board, and the other three are on an island to the east. You have to build your base towards the east until you can create a sub base so you can get your engineers over to the island. You'll have to take out a few ships with air power before this is possible.
Red Alert Walkthough Index