"On December 16, 1842, the US brig-of-war Somers dropped anchor in Brooklyn Harbor at the end of a cruise intended to teach a group of adolescents the rudiments of naval life. But this seemingly harmless exercise ended in catastrophe. Commander Alexander Slidell Mackenzie came ashore saying he had narrowly prevented a mutiny that would have left him and his officers dead. Some of the thwarted mutineers were being held under guard, but three had been...