hi
I am a descendent of Balthazar and Louise Montag, Prussia to Osceola, Fond du Lac Co, WI in 1872. I found imm records for a Jacob and Anna with a son Ignatz from Prussia via Bremmen (Baltimore) 1860 to WI. see #228 on list.
http://www.immigrantships.net/v10/1800v10/uhland18600627.htm... are your Montags Catholic ?
I am searching for more info on a Anna Maria (Montag, poss first husband was Montag) b 1804 married to a Carl Berg in West Bend from about this time. I think Anna is somehow related to my Balthazar because his 2 dau are with the Berg fam on 1880 census. If you find any clues, please let me know, thanks.