Historical clue formulations

• Heart — 2017-03-18
• Bravery — 2016-07-18
• Heart — 2011-10-21
• Heart — 2006-10-27
• "Buck up!" — 2001-07-29
• Pluck — 1997-06-11
• Mettle — 1995-07-14
• Brecht's "Mother _____" — 1994-04-20