Today is the five-year anniversary of the battle of Combat Outpost Keating, one of the deadlier battles of the war, that occurred near the town of Kamedesh in eastern Afghanistan. Eight soldiers lost their lives, and 28 were wounded defending what was really an indefensible position against over 300 Taliban insurgents.

Tapper, who wrote the best-selling book on the battle titled, “The Outpost: An Untold Story of American Valor,” took to Twitter this morning to both honor those who lost their lives and to give a mini history lesson for those who are just learning about this underreported story of Americans at war: