Actually I believe this footage was colourized, I've seen some of it in B&W before. Either way its interesting to view, and really, as you near the end its rather sobbering.

On a kilt related note, you do get to see a few scenes of kilted 'Scots' in action.
At 00:07 appears to be the London Scottish marching to the front.
At 01:22 and again at 02:58 are quick views of kilted troops charging into battle.



Private, London Scottish (WW1)