Command & Conquer: Red Alert 2 Tips

Easy france victory
The French grand cannon has the ability to completely destroy some bases but the problem is getting it close enough. Once you have the ability to build a grand cannon (power plant, barracks, ore gatherer, airport), build a chain of power plants leading up to within a short distance of the enemy base. This will enable you to build a grand cannon right outside the enemy base! It will destroy them in under thirty seconds. Back them up with some tanks, or consider building a second cannon!

Alternatively, you could build an MCV and deploy it near their base. Back this up with tanks in case you run into any enemies. This should cost less than the power plant method.