Christmas is one of the most celebrated holidays on earth. But that doesn't mean that conflicts simply freeze every December 25th.

Important events in both of America's most formative wars — the Revolutionary War and the Civil War — took place on Christmas. British and German troops even celebrated the holiday together on Christmas Day during WWI.

Here's a look at some of the major military events that have fallen on Christmas, a date with a surprisingly rich history.

Pierre Bienaimé wrote a previous version of this post.

 5. 1776 — George Washington crosses the Delaware River