Scout up, wall entrances with combo of paladins and blizzards/SEAL IFV, keep pumping GGIs for tanks and post them in your base. Cap any Oil Derrick you can get. If at any moment you ceased on creating something, you're doing it wrong.
EDIT : Okay, it's honestly been awhile since I've done this... so I've tried Relentless again on Easy as everyone seems to be having problems with it on that difficulty.
This is the initial force I have when I conquered the base. I've waited for my units to recover first before mounting the attack. I took a more careful approach. As you can see, I have a lot of initial units on the view and more to spare on the back
This is after 6+ minutes, about half through the attack. As you can see I've already expanded further and spread my initial units while losing some of them, yet still retain a whole army through all the attacks (Prism tanks are very useful against infantries).
This is the final result. Not so much units lost after last picture. It's a tight defense, and I've retained 3 of my mini expansions.
See? It's not even a close call. I only lost one bar of health from WCD and no structure losses in base. I'm far from the best player in MO, never even completed the campaign on Normal.
Edited by Handepsilon, 11 December 2017 - 04:29 PM.