travelling army
... that a football team's travelling army of supporters is often referred to as its 12th man?
... that a <a href="./Association_football" id="mwAYE" rel="mw:WikiLink" title="Association football">football</a> team's <b id="mwAYI"><a href="./Glossary_of_association_football_terms" id="mwAYM" rel="mw:WikiLink" title="Glossary of association football terms">travelling army</a></b> of supporters is often referred to as its <a href="./Glossary_of_association_football_terms#0–9" id="mwAYQ" rel="mw:WikiLink" title="Glossary of association football terms">12th man</a>?