This info was found in a genealogy book on the Bischmisheim area of Germany - I will post it to hopefully help those researching this surname.
SCHACKMANN, Johann Friedrich, farm laborer, lived in St. Arnual in 1867; married 17 Aug 1867 in St. Arnual, Germany to Magdalena CHRIST of Bischmisheim. She was working as a servant/farm girl in 1867 in St.Johann. She was b. 14 Sept 1836 in Bischmisheim.
Children: 1. Jacob b.4 Jan 1863 Bischmisheim (premarital, legitimized by marriage)
Hope this info helps someone with their research, good luck. ..Marcy