Mini Civil War Compass necklace.  Comes with instructions.

Gently turn the compass until the red arrow points to "0" (North). Now visualize 360 arrow, each pointing to a different number. Here's where some of those arrows point.

From: Gettysburg

194- Ft. Sumter, SC

205- Appomatox, VA

217- Harper's Ferry, WV

220- Antietam, MD