Hildesheim

I have been searching for the marriage record of my Grandparents and the birth records of my father and his two brothers. Grandfather, Wilhelm Bartling from Dudensen, and Grandmother Louise Zimmermann from Moordorf emigrated in 1914 along with the three children, Fredrich, Erich, and Hans.
The records do not appear in the towns of my grandparents.
The Ellis Island web site shows they came from Ludwiyshelm. I believe this is a mistake as I can not find that town.
I have reason to believe it may be Hildesheim as I located some of my parents friends on the Ellis Island site and they show Hildesheim as the town in Germany.
Does anyone have access to any records that would at least tell me that if that is the correct town for the marriage?

Bill Bartling in Austin Texas