Historical clue formulations

• Unbiased opinion, e.g. — 2020-09-26
• "Original copy" or "open secret" — 2018-09-11
• Military intelligence, e.g., according to George Carlin — 2011-06-14
• Clearly confused, e.g. — 2010-06-28
• Hell's Angels, e.g. — 2009-10-25
• Head butt, e.g. — 2006-05-04
• Civil war, e.g. — 1995-01-24