Port supply question

[FrankGallagher]

Still learning the system. In a game against the AI, Tobruk and Benghazi are always at 0 supply stockpiles, every turn. I never get a message that the ports have been interdicted, and I don't see any Allied units within range that *could* interdict. So why are stockpiles always at 0?

I'm not complaining about the result, just trying to understand it in terms of the game mechanics. And if there's any way to counter that.

[AlvaroSousa]

You probably overloaded North Africa with too many units. If the stockpile is zero if means you have too many units in North Africa as the Axis. The Supply system over there is limiting.

Supply page 61 of the manual.

[FrankGallagher]

Ah,yeah that's gotta be it. I was just expecting to see an amount there before the units used it. Thanks for the answer.