Historical clue formulations

• Treacherous peak in the Alps — 2016-01-05
• Swiss peak in an Eastwood title — 2014-03-25
• Peak southeast of Bern — 2008-05-10
• Trevanian's peak — 2007-04-21
• "The ___ Sanction" — 2007-04-03
• Much-climbed Alpine peak — 2006-03-26
• Swiss Alp — 2005-10-13
• "The ___ Sanction" (Trevanian book) — 2004-06-20
• Trevanian novel "The ___ Sanction" — 2002-04-14
• Peak in the Bernese Alps — 2001-10-28
• Peak of the Alps — 1998-09-19
• "The ___ Sanction" (1970's thriller) — 1997-06-01
• Peak in a Trevanian title — 1996-02-09
• Trevanian's "The ____ Sanction" — 1995-12-01
• Trevanian's "The _____ Sanction" — 1994-12-03
• Eastwood's "The _____ Sanction" — 1994-03-13
• Trevanian's "The _____ Sanction" — 1994-01-31