Lillebakken (Lillibakken)

Searching for information about my wifes grandfather Nils Olsen Lillebakken from Rindal in Norway. He was born Sept. 28th 1878 and emigrated in 1910 to America, leaving wife and 3 year daughter behind. We have found that he on Nov. 1st 1913 crossed the Canadian/US boarder into USA for the first time to visit a friend in Spokane Wash. Also that he registered in sept. 1918 for military service with the Local Board for the County of Marshall, Iowa. His employer's name was then Jno. Jacobson of Marshalltown and his adress was Lodging Hotel 102? Minneapolis, Mn. After this he disappeared and as far as we know, never returned to Norway. Any information about him or his two brothers, Erlend O. Lillebakken Negaard b. jan. 6th 1872 and Lars O. Lillebakken b. jan. 26th 1877, will be highly appreciated. Regards Stefan Neumayer