Question: The Invincibles is a label given to a football league team that plays a whole season unbeaten. Arsenal achieved it most recently, but which team did it in 1888-89?
Sentence (from "James Trainer"): James Trainer (born 7 January 1863, Wrexham - died 5 August 1915, Paddington, Central London, England) was a Welsh association football player of the Victorian era.
Relevant evidence: No