The documentary about World War I features never-before-seen footage to commemorate the centennial of the end of the war. 'The Lord of the Rings' director managed to pull off the huge technical achievement of adjusting much of the black and white footage into colour.

The documentary also featured restored recorded interviews with British soldiers involved in the war, giving viewers a very real insight into what it might have been like.

Here's a behind-the-scenes look at how Peter Jackson made the documentary if you're curious...