Bryn provided evidence from 1916.
The term jusqu’auboutiste, referring to a person who advocates carrying on a conflict ‘jusqu’au bout’, or until the bitter end, was used in 1917 in a magazine article:
As a reasonable jusquaboutist I have some misgivings about Mr. Henry Arthur Jones’s farce parable, The Pacifists.
1917 Punch 12 Sept., p. 195/1
We know that the term was used earlier than this in French, and that jusqu’au bout was used earlier in English, and earlier in the war in a specifically military context (1915: ‘the war must be continued “jusqu’au bout”’). Is there any earlier evidence of jusqu’auboutiste as used in English?
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To commemorate the centenary of the start of the First World War (1914–18), the OED is revising a set of vocabulary related to or coined during the war. Part of the revision process involves searching for earlier or additional evidence, and for this we need your help. Our first quotations are often from newspapers and magazines, and we know that there may well be earlier evidence in less-easily-accessible sources such as letters, diaries, and government records, many of which are now being made available in digital form for the first time.
Posted by OED_Editor on 28 January 2014 19.42