After she encounters a poem about love and friendship etched on the Homomonument in Amsterdam, Hélène Giannecchini is moved to attempt to do justice to a form of relation often subordinated to romance. A friendship is a filiation we choose, one that can reconfigure our understanding of co-existence. It holds love, laughter, dissent and solidarity; it can be a site of political struggle, of reinvention and rest. Thinking back to her own unconventional family formation, she sets out to piece together an alternative genealogy of lives excluded from normative discourses, whose traces may only remain in memory and archival fragments. In searching and sensitive prose, Giannecchini sifts the past to bring marginal existences into communion with each other, preserved through loving acts of witness and made full of meaning by friendship's generative force. Roving from Saint-Just's revolutionary ideal of amity to Donna Gottschalk's photography documenting radical lesbian organizing in 1960s and '70s New York, interspersed with unpublished images acquired magpie-like through chance and circumstance, An Army of Lovers Cannot Fail forms a slantwise account of queer life in the twentieth century, and a moving testament to the liberatory power of friendship.