A recent post on the forums at The Miniatures Page pointed me to the Digitized Monograph Collection held by the Donovon Research Library at the US Army’s Infantry School on Ft. Benning. This is a great collection of personal accounts and other papers written by US Army officers. These include WWI through the present. I’ve so far only explored the WWII section, but that includes accounts at many levels from platoon up through corp as well as specific tactical problems, campaign synopsis, etc. Many of the monographs I’ve quickly looked at contain maps and should provide a great resource for writing interesting wargame scenarios.
Note that I (and others from what I saw on the TMP forum) had to allow a security exemption for their browser to gain access.