Historical clue formulations

• Bull or Celtic — 2015-04-13
• Bull or Celtic — 2013-06-09
• Celt or Cav — 2011-01-27
• Hornet, e.g. — 2008-05-11
• Hornet, e.g. — 2006-06-16
• Hornet, e.g. — 2005-11-13
• Bull or Cav — 2004-05-23
• Hawk or Hornet — 2001-02-04