A special exhibit is a hand-written letter of Wallenstein to his field Marshal Gottfried Heinrich zu Pappenheim of 15 November 1632, which he wrote on the evening before the battle of Lützen. Pappenheim was to be fatally injured in battle on the next day, carrying the letter on him, to which the large blood stains on the paper bear witness. The collection also includes a ribauldequin from the year 1678, the so-called death organ, which was constructed by the Imperial gun founder Daniel Kollmann, and represents an attempt to manufacture a quick-firing gun for the Imperial Army.[14][15]