It could be the old saying, 'The victor writes the History'. The political objective of the Northern War efforts changed from "Preserving the Union" to "Freeing the Slaves" 2 years into the War in 1863. This is just about the time that "Gordon" was "discovered"? Humm?

We know that the Emancipation Proclaimation was issued not to actually free the slaves but to end the english support to the Confederate States in January 1863.