Upon returning to Washington, Whitman contracted with Gibson Brothers to publish a pamphlet of eighteen poems that included two works directly addressing the assassination—"When Lilacs Last in the Dooryard Bloom'd" and "O Captain! My Captain!". He intended to include the pamphlet with copies of "Drum-Taps". The 24-page collection was titled "Sequel to Drum-Taps" and bore the subtitle "When Lilacs Last in the Door-Yard Bloom'd and other poems". The eponymous poem filled the first nine pages. In October, after the pamphlet was printed, he returned to Brooklyn to have them integrated with "Drum-Taps".