If you liked Glory, you might also like...

Gettysburg
Gods and Generals
Red Badge of Courage

Couple of my favorites:

Zulu Dawn(1979)
http://www.imdb.com/title/tt0080180/?ref_=nv_sr_1

The Lighthorsemen(1987)
http://www.imdb.com/title/tt0093416/board/threads/

Ride With the Devil (Director's Cut)



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Flags of our Fathers was great and true to history. Empire of the Sun was another great film, but I'm a little suspicious of some of the history. Most of it seems realistic to me, but the transformation of the Japanese fighter base into a kamikaze base seems a little convenient. It was good for dramatic development, but I question if anything like it really happened.

The best diplomat I know is a fully charged phaser bank.

For another Civil War movie, you should try to find Pharaoh's Army. Not well known, but is an absolute gem. Very authentically portrayed, all the way down to the clothes the actors wear.

Platoon

Midway
Patton
Dunkirk
Go for Broke! (about the 442nd Infantry Regiment, Japanese Americans who fought in Europe)
Hacksaw Ridge (about a conscientious objector who won the Medal of Honor without firing a shot)
Master and Commander: The Far Side of the World
Devotion (about one of the first Black Navy pilots)
Men of Honor (about the first Black master diver in the US Navy)