Claus Lauritzen Christensen

My name is Irene Denman, and I'm looking for anybody how can help me find out which ship Claus Lauritzen Christensen arrived on in the US. He was a chaplain in the norwegian community in the US. He was born on Ærø (Aero) in 1820 and in 1843 then he was 23 he went to the states with his 1st. wife Martha, how was born on Langeland. He later married a norwegian by the name of Berit? He was among the founder of St. Ansgar in Iowa and he were one of three founders of the Norwegian Evangelical Lutheran Church in America. He served with the 15th Wisconsin Infantry Regiment, known as the Scandinavian Regiment during the civil war. I hope somebody out there can help me. And if you know of other things releated to him, I'm also interested.