This collection consists largely of letters from Roger Casement to Captain Hans Boehm, during Casement's stay in Germany in 1915, as well as some associated material (photographs, medals) relating to his first contact with the German authorities in November and December 1914 and the formation of the Irish Brigade in 1915.

[Letter from Roger Casement, Berlin to Captain Hans Boehm, expressing concern about the formation of the Irish Brigade.]

[Letter from Roger Casement, Berlin to Captain Hans Boehm, referring to the possibility of Boehm going to the camp at Limburg in person.]

[Letter from Roger Casement (U.S. Consulate General, Munich) to Captain Hans Boehm, referring to his decision to go to Berlin and visit the camp at Zossen.]

[Letter from Roger Casement, Zossen to Mrs. Boehm, thanking her for her card and the news of her husband's safe arrival.]

[Letter from Roger Casement (Hotel Baselerhof, Prannerstrasse 11, Munich) to Mrs. Boehm, thanking her for the cards and cuttings she sent him.]

[Letter from Roger Casement (U.S. Consulate General, Munich) to Captain Hans Boehm, referring to enclosed letters from the three corporals at the Limburg camp.]

[Letter from Roger Casement, Berlin to Captain Hans Boehm, expressing his disappointment at the delays in the formation of the Irish Brigade.]

[Letter from Roger Casement, Frankfurt to Captain Hans Boehm, consisting mainly of the German Government's declaration of good will in relation to any possible invasion of Ireland.]

[Letter from Roger Casement to Captain Hans Boehm, saying that he is still without news.]

[Letters from Roger Casement, Berlin to Captain Hans Boehm, referring to Irish corporals at the Limburg camp willing to form the Irish Brigade under certain conditions; they include a transcription of a letter by Joe McGarrity on Irish pro-German events in Philadelphia, USA.]

[Letter from Roger Casement (U.S. Consulate General, Munich) to Captain Hans Boehm, thanking him for his letter and for news of a messenger going to Ireland.]