Pulitzer Prize-winning composer David Del Tredici (b. 1937) has gained recognition as a composer for both instrumental and vocal settings. Although his instrumental contributions include solo, chamber, and orchestral works, to date he has only written one composition for wind band. A conductor must devote himself / herself to score study and analysis in order to form an accurate interpretation and to conduct effective rehearsals. A vital part of score study and analysis is familiarity with the composer’s technique and style of writing. A brief biographical sketch presents Del Tredici’s background, education, honors and awards, academic career, and influences, as well as a discussion of his compositional and orchestration techniques. Both movements of In Wartime are analyzed using the elements of melody, harmony, form, rhythm (which includes tempo, meter, rhythm, and rhythmic techniques), orchestration, texture, and dynamics. Rehearsal considerations for each movement are presented based on the author’s experience rehearsing and conducting In Wartime. The intention of this document is to facilitate conductors in their study and preparation of In Wartime in order that they may realize more effective rehearsals and inspired performances. Included in the appendices are trumpet parts transposed to the key of B-flat and instructions for the construction of the wind machine indicated in the score.