>39th New York Infantry regiment "Garibaldi's guard"
Do not let the name fool you, the Garibaldi guard did not fully consist of Italians. In fact, it was the most international regiment of the ACW.
It was mostly formed of the Italians from New york, but the regiment itself was commanded by a hungarian, the surgeon was german, and people in the regiment were from England, Switzerland, Portugal, Croatia, Bavaria. They even had several deserters from the French foreign legion. Most of the soldiers already had military experience from wars in Europe.