Thu Feb 26, 2015 10:27 pm
Don't know about the murky situation with the land mine.
I wasn't sure what you meant at first, but I now understand you are talking about the besieging force on Fort Pickens and that they are set to bombard. I will assume that you have artillery in the stack, but it is also currently possible to press the Bombardment SO button regardless of actually being able to bombard. Your force must simply be entrenched at >= level 3. This is a known issue, which Posus said he would be fixing.
So, assuming your force does have artillery and is legitimately eligible to bombard, in this specific case, you still cannot block Fort Pickens from receiving Navel supplies through their harbor. Bombardment only prevents normal supply distribution from moving through a region which is targeted by bombardment.
Naval Supply uses a completely different mechanism, which can only be blocked by brown-water blockading the harbor exit point(s)[SUP]1)[/SUP]. But bombarding artillery can and will augment a brown-water blockade, if you can bombard the harbor exit-point with bombardment alone. Check the tool-tip of the harbor exit-point region.
Generally you need 8 combat elements to blockade a harbor exit-point. This goes up by 4 if artillery friendly to the harbor owner can bombard into the harbor exit-point. It also goes down by 4 if the blockading faction can bombard into the harbor exit-point. So, -4 for Fort Picken's own artillery, +4 for your artillery = 8 naval combat element needed to blockade the harbor exit-point. BTW Fort Pickens has 2 harbor exit-points, Pensacola Bay west of the fort and Cerro Gordo Sound east of the fort, so it will be difficult indeed to actually blockade Fort Pickens.
[SUP]1)[/SUP] The exception to this are harbors with distant-blockade zones. For example, Richmond can be brown-water blockaded by stationing your ships in Hampton Roads.