I could not get over two things about Rebel Yell:
Since 1849 — Putting that year on the bottle is just silly since the Civil War did not begin until 1861 and thus the Rebel Yell hadn’t been created yet.
The name — Rebel Yell. Kentucky, a border state, stayed in the Union during the Civil War. While the were certainly Southern sympathizers there, choosing Rebel Yell for the name is historically misleading.