The Economist [economist.com] is carrying a free story (free except for the annoying subscribe pop-up) about a French slave trading ship that crashed into a a reef and sunk just off of the tiny island named "Île de Sable" on July 31st 1761.
The Island is a tiny mountain top of sand 500 miles east of Madagascar. The island was subsequently re-named Tromelin Island (google map link) [goo.gl] for reasons explained in the article. Zoom in and out again to see just how desolate a place this still is.
The shipwrecked French crew, built a boat out of the wreckage of their ship, with the help of some of the slaves. The boat they built, for lack of materials, could accommodate only about half of the people stranded. So all 123 Frenchmen climbed into the boat, left the 88 remaining slaves (out of an original 160 or more), and sailed off toward Madagascar, with a promise to return.
The article is the story of how that promise was not kept, not entirely the fault of the French First Officer, who pleaded for a ship to rescue the slaves, but was rebuffed at every turn. Too busy worrying about the British fleet was the excuse.
Finally in November 1776, 15 years after the shipwreck, with the British Fleet otherwise distracted, a French ship arrived and rescued the last seven remaining survivors (all women except a 8 month old baby boy) from the island.
The story is an interesting read, and documents how easy it was to be callously abandoned in that day and age. (Not nearly as callous as being sold into slavery by your own disaffected relatives, mind you!).