John Barton "Jack" Grimwood, was an English footballer who played as a half-back, he joined Manchester United in May 1919, and made his debut for the club in the first Manchester derby, on which date?
John Grimwood:  He joined Manchester United in May 1919, and made his debut for the club in the first Manchester derby on 11 October 1919, as a replacement for Lal Hilditch, who was away on international duty.
i don't know