Boeselager's younger brother, Philipp von Boeselager, later claimed that he and his brother began marching their columns on Berlin on 20 July, in support of the plot, but hearing of the plot failure, turned around and thus were not implicated in the plot. In a review of the book written by Philipp about their experiences in the resistance to Hitler, the historian István Deák has expressed doubts whether the ride west actually took place. He wrote he could not help feeling that it was an account not of what Philipp von Boeselager did, but of what he longed to do.