 1928–1929 “Mathematische Annalenstreit”, the conflict in the editorial board of Mathematische Annalen. Hilbert, thinking he is about to die, feels a need to make sure that after his death Brouwer will not become too influential, and expels him from the board in an unlawful way. (Hilbert’s motivation as described here is documented in letters from people close to him: Carathéodory to Einstein, October 20, 1928; Blumenthal to the publisher and editors of the Mathematische Annalen, November 16, 1928; Born to Einstein, November 20, 1928. Copies of these letters are in the Brouwer Papers  at the Noord-Hollands Archief in Haarlem.  Relevant quotations from these can be found in van Dalen, 2005, p. 604 and p. 613.) Einstein, also member of the board, refuses to support Hilbert’s action and does not want to have anything to do with the whole affair; most other board members do not want to irritate Hilbert by opposing him. Brouwer vehemently protests. In the end, the whole board is dissolved and immediately reassembled without Brouwer, in a strongly reduced size (in particular, Einstein and Carathéodory decline). The conflict leaves Brouwer mentally broken and isolated, and puts an end to a very creative decade in his work. Now that the two main contestants are no longer able to carry it on, the “Grundlagenstreit” is over.