There were all kinds of mercenaries in the Union Army. The Union actively recruited in Europe even though they had agreed not to. England refused to allow English citizens enlist, although some did anyway. Germans were the primary target of the mercenary seekers.

Stefan, I suppose you vill now zay za Yankees cheated all da vay ven zey gebusted zer pledge not to use no imported nazis gegen das Konfederacy. Was denkst du, meine Freundin? Konnen wir etwas Bier trinken durch all zorts of heilen zur Lincoln machen?

Ich trinke mit Sigel!