Voodoo Ships: Fantasy

The raised ships sailed on sacrifices of blood and rum. Every mast was a crossroads. Every anchor was a tombstone. Live crews shipped on them, but the ghosts and gods were thick around them, enough that to a person with the sight, it looked like the ghosts were covering the entire ships in a heavy cloak. They did serve, sort of, against the invaders. Soon enough the slavetakers learned to fear the sight of tattered sails and ships with holes in their hulls. If the slaveships sank, the ghosts of those chained in the hull flew up and filled the sails of the raised ships, and they sailed on.

Inspiration: "Death Before the Mast" by Alestorm, and an Escape Pod short story about possession by the spirits of pirates resurrected by bone rum, Pirate Solutions (http://escapepod.org/2009/11/26/ep226-pirate-solutions/) by Katherine Sparrow (a really, really excellent short story that my description does not do justice to).
Story Potential: High-ish? I am confused by this story.
Notes: Say voodoo powers raise up dead ships and escaped slaves crew them and they destroy the slave trade. This story could be really lovely historical wish-fulfillment. Lots of historical research required.