Ancestry.com recently released UK Incoming Passenger Lists from 1878-1960 on their website. A little searching located my great-grandmother Neill's brother, Virgil A. Rampley, who was in World War I.
The images are pretty nice. The screen shots shown here are from the heading (which indicates the "Lancashire" landed on 21 August 1918) and the bottom of the page where Virgil Rampley's entry appears. Several of the men on the boat with him were also men from Hancock County, Illinois.
Source Information: Ancestry.com. UK Incoming Passenger Lists, 1878-1960 [database on-line]. Provo, UT, USA: The Generations Network, Inc., 2008. Original data: Board of Trade: Commercial and Statistical Department and successors: Inwards Passenger Lists. Kew, Surrey, England: The National Archives of the UK (TNA). Series BT26, 1,472 pieces.
