Then in 1969 Herbert Ehrman's The Case that will not die marshaled the case for the defense as thoroughly as Montgomery and Russel had put the case for the prosecution.
This is an excerpt from the book Postmortem: New Evidence in the Case of Sacco and Vanzetti by William Young and David E. Kaiser. I know roughly what author wants to say: Ehrman asserts that Sacco and Vanzetti were innocent and adopted the point of view of the defense (in contrast to Russel and Montgomery). But what is the exact meaning of the verb "marshal for"? I am familiar with the meaning of this verb but it would imply that the author (Ehrman) chose the facts for his purpose and thus his book is manipulative.