Upon his return to St. Louis afterwards , he began his own building and contracting business .
When Ziegenhein turned 17 , the Civil War started , and so he served the Union Army .
Upon Ziegenhein 's return to St. Louis afterwards , Ziegenhein began his own building and contracting business .
When Ziegenhein turned 17 , the Civil War started , and so he served the Union Army .