Supplement to the Official Records of the Union and Confederate Armies. Part II, Vol. 20, PP 603-637. Edited by Janet B. Hewett. Assistant Editors Joycelyn Pinson and Julia H. Nichols. Broadfoot Publishing Company, Wilington, NC, 1995. Record of Events for Twenty-seventh Iowa Infantry, October 1862-June 1865.
The companies kept records of activities, including how far they traveled (and by what method i.e. marched, by train, by steamer). Some Companies kept more extensive Records of Events than others. Even though there is very little mention of specific soldiers, it gives you a pretty good idea of what they were doing during a specific time period.
To see a record of events associated with a particular company, click on the company letter above. NOTE: be sure to also check out the Record of Events for the Staff and the Regiment. It gives pretty extensive information about the 27th Iowa in general.