Gysler family tree

Hunting for records of a John (Johannes) Gysler who was probably born in an area called Sandsver around 1840 or so. He served in the Scandinavian Brigade during the American Civil War with his enlistment date being Sept. 1862 in Chicago, Illinois so probably arrived in America somewhere around that time. I cannot locate a passenger manifest which has his name listed although; in an earlier search I had found a manifest with his name it seems to no longer be posted. Raymond E. Gysler