[Suhiir]

Fastboat
This is EXACTLY the sort of thing I'd hoped for when I made the scenario. You face a number of problems, some immediate, some longer term, which do you prioritize? The reinforcing units (particularly heloborne) can be used in a number of ways; reinforce the base, a flanking attack, land in the rear and hunt mortars, and others. Use your artillery to break up attacks, to suppress their mortars, try to do both? Aircraft are great for close support (if you have an FO, and I intentionally made the pilots "experienced" so aircraft are pretty reliable), but is that mortar cluster that's suppressing your defenders a higher priority?

There are no "right" or "wrong" answers, just the ones you, the player, decide to implement.