Historical clue formulations

• *Anti-Civil War Northerner — 2014-03-26
• Venomous viper — 2003-06-02
• Police officer's woe? — 2002-10-15
• Dangerous biter — 1999-08-20
• Venomous viper — 1996-09-10
• Dangerous snake — 1995-12-11
• Pilot snake — 1995-09-28