The Battle of Little Round Top was critical to the Union victory at Gettysburg, and Col. Joshua Lawrence Chamberlain and the 20th Maine held the line. We'll look back 150 years later.

Thoms Desjardin, historian and author, his books include Stand Firm Ye Boys From Maine: The 20th Maine and the Gettysburg Campaign, These Honored Dead: How the Story of Gettysburg Shaped American Memory, Joshua L. Chamberlain: A Handbook.