You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when were subs first used in english football?" whose answer is as early as the 1850s.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when were subs first used in english football
Useful Output:

Doc 1: The first recorded mention of substitutes came in 1863. “The Charterhouse eleven played a match in cloisters against some old Carthusians but in
Doc 2: The first substitution in British football happened in August 1965 during a game between Charlton and Bolton and that Archie Gemmill was the
Doc 3: The International Football Association Board (IFAB) officially added substitutes to the Laws of the Game in 1958. This change was a major shift
Doc 4: But the first league substitute was 1965.
Doc 5: In 1958, official rules on substitutions were introduced into English football for the first time – each team could make one sub as and when they saw fit.