try this procedure... 1. Lure enemies as far away from the base as you can. 2. Attack base from a corner; don't forget to dodge! 3. If enemies get too close, repeat steps one and 2, especially if you've almost defeated the base. 4. Hope you get some allies built before enemies attack. 5. defend the base with your life.
i thought giant base was easy i just charged close to base then moved around while shooting everything thats an enemy until i got rage then i killed the base and enemies at same time