Charles William Alcock, Football: The Association Game… (1906)
“ The provision which keeps a man always on-side as long as there are three between him and the opposite goal, offers undoubtedly a great temptation to forwards to get as far up as they can consistently with safely. To meet this, it was found necessary to strengthen the first line of defence, and the centre half-back was introduced therefore, though his mission is, in a great measure, to feed the forwards, to enable the other halves to pay more attention, in fact to devote themselves mainly, to stopping, or at least frustrating, the tactics of the opposite wing. ”
