Carlos Roloff

Polish-born Cuban general and liberation activist, who fought against Spain in the Ten Years' War and the Cuban War of Independence in the Las Villas Province.

https://en.wikipedia.org/wiki/Carlos_Roloff

Roloff served in the Union Army during the American Civil War in the 9th Ohio Infantry Regiment, working under the command of August Willich. He obtained the rank of captain before being discharged when the unit disbanded in June 1864.