The deliberate destruction of the university library in Louvain during World War I caused an international outcry, but also elicited constructive reactions. One of the most impressive responses was the collection in England of an enormous donation of books to replace those lost, a project coordinated by the John Rylands Library in Manchester. Although the librarian, Henry Guppy, documented the donation in issues of the Bulletin of the John Rylands Library, this generous and altruistic work has received little mention in the recent scholarship on the burning of the library and its rebuilding. This article charts the development of the project and the extent of the contribution, drawing on Guppy’s publications and documents in the library archives of the University of Manchester, Oxford University and the University of Toronto. Some of the most valuable gifts from private individuals receive special attention, as do the institutional donations by the Bodleian Library and the University of Toronto.