What are some Red Herring in the novel And Then There Were None

Red Herrings are a technique among writers of mystery novels to manipulate the reader into uncertainty about lot and character. In this novel, you might consider the reader being lead to believe that the unknown Mr. Owen might be an outside suspect of the killings. We are also lead to believe that Justice Wargrave, the actually killer, is murdered so the reader can exclude him as a suspect.

What’s the red jarring with Armstrong in the book And then there where none