Try these databases first to find materials related to military studies topics.
Choose Words in Subject from the search menu and then type the branch that interests you. A search for the subject Artillery retrieved 30 hits. The search Army and Medical retrieved 29 hits!
Encyclopedia Britannica Online
Online version of the Encyclopedia Britannica and Merriam-Webster Dictionary & Thesaurus
Virtual Reference Library
A collection of encyclopedias, almanacs, and specialized reference sources for multidisciplinary research
Encyclopedia.com
Composed of high-quality articles from the Columbia Encyclopedia, Sixth Edition
Encarta (Microsoft)
A gateway to 17,000 encyclopedia articles, multimedia, a talking dictionary, and a world atlas