The website Lexikon Erster Weltkrieg offers a dictionary about the First World War. This dictionary is a project of Iportale, a German firm with a number of general portals and thematic online dictionaries. The online dictionary brings not only alphabetically organized lemmas, but also a summary chronicle (Chronik) of events during the First World War, and a number of image galeries about various fronts, the main generals of the major armies, weapons, aircraft and ships. You can use the free search field for searching the lemmas. The original sources of the images are not indicated.
The website contains also a selection of letters (Feldpost) written by students who served as soldiers at the front and died during service. The letters stem from the often reprinted collection edited by Philipp Witkop, Kriegsbriefe gefallener Studenten (first edition Gotha 1916), translated by A.F. Webb, German Students’ War Letters (2002). The bias of the letters is duly noticed, as is their use for propaganda. The website can only be viewed in German.