I agree with Bill that there were many former Union soldiers who migrated South and West after the war. In fact, the Grand Army of the Republic, an organization of former Union soldiers and sailors, had "camps" in quite a few Southern cities both large and small. I know that at least two such camps existed in Birmingham, Alabama. In north Alabama, bordering the city of Decatur, northern industrialists, some of them former Union soldiers, formed the city of New Decatur (later called Albany, and still later merged with the city of Decatur). To this day, there are streets in that section of town named after both Union and Confederate generals. There you will find Grant St. and Sherman St. alternating with Lee St., Johnston St., and Jackson St.; You could spend perhaps days or even weeks at the National Archives searching through procurement records of the Union Army, and still not be able to prove that any one individual produced saddles for the army. Here is my best guess: If he was a Union man, even though Nashville was occupied early in the war, he might not have felt comfortable living among staunch Confederates (there were more Unionists in mountainous east Tennessee - not so many in the central part of the state). Or, some company in Louisville may have had a contract to produce saddles, and convinced him to come there to work for them. Unless some descendant somewhere has letters that shed some light on his politics, guessing is about all we can do.