You can do alot more with for limbs, thats all i got lol
I would say the invention of new technology such as the tank, machine guns, and other weapons made every attempt to gain yardage in trench warfare very bloody costing hundreds of lives for every yard gained or lost.
When analyzing sources, historians obviously want to stay and remain neutral due do the implications a biased historian might have. If historians wouldn't be neutral, this would make them very bad as having a biased view of history is something historians and the whole field of history would like to avoid.