The set of thematic research guides for archival research concerning the First World War is part of the Cendari portal for a collective European digital archival infrastructure. The core of the Cendari portal is the creation of a directory of archives in Europe and their collections. A second service is the creation of archival research guides. In this section you can find sixteen guides concerning the First World War. These guides deal for instance with prisoners of war, the importance of diaries and personal narratives, the role of women, religion, coercion in the armies, medicine and workers’ movements. Poland and Russia are among the countries receiving particular attention. There are also nine similar guides for research on medieval history and (religious) culture.