“The most horrific experience of our lives”: Grappling with Fallujah 20 years on.

It's been two decades since the Battle of Fallujah , the bloodiest battle of the war on terror, during the Iraq War .

At the time, the battlefield was filled with troops who believed they were defending their country against terrorism.

This week on Reveal, the team partners with the nonprofit newsroom The War Horse to join Mike Ergo’s unit as they reunite and reflect on what they did.