76
The American Revolutionary war last for several years and included hundreds of battles. The coordinates for this cache can be found by just identifying the dates on which 8 of them occurred.
The final coordinates are North 38 5A.BCD; West 096 1E.FGH
Battle of Bemis Heights 10/A/1777
Battle of Yorktown 1B/9/1781
Battle of Chelsea Creek C/27/1775
Battle of Trenton 1D/26/1776
Battles of Lexington and Concord E/19/1775
Siege of Fort Ticonderoga F/10/1775
Battle of Bennington G/16/1777
Siege of Charleston 3/H9/1780
You can check your answers for this puzzle on GeoChecker.com.