I have a website at MyFamily.com with many old photos of the Sahls and Yeagers who emigrated from Alsace-Lorraine. Caroline Yeager married William Matthew Sahl in 1885 in Des Moines, Iowa. William Sahl had two brothers and a sister who stayed in New York while he moved westward to Iowa, Nebraska, and finally Colorado. Please see the site at
http://www.myfamily.com/exec?c=site&htx=main&siteid=... to see if there is a connection with your Sahls.