For four straight years, Union and Confederate soldiers battled during the bloodiest war in American history ... and scholars dispute even the most well-researched estimates.

In 1914, Germany began producing Type U 19 submarines (pictured), which were some of history's most significant ... war, and Germany decommissioned it before the submarine saw a single battle ...

To honor the occasion, reenactors in central Massachusetts will re-create one of the most significant battles of the Revolutionary War - the battle of Concord and Lexington. Here's what to know ...

This Live Lesson commemorates the sacrifice of those who lost their lives in one of the most significant battles in history. Fought between July and November 1916, the Battle of the Somme was one ...