I remember the first ever game we played on a sunday over 40,000 at HR v Derby in the Fa Cup 0-0 around 1974 must have been 37,000 city fans there
http://www.11v11.com/matches/coventry-city-v-derby-county-27-january-1974-213645/
there was also a bomb alert at the match,and they chanted IRA...