Sentence:  In stretches, this new Apes is an audacious, idiosyncratic piece of blockbuster filmmaking: a mix of Pixar, revenge Westerns, and Apocalypse Now, told almost entirely from the point-of-view of a posse of gun-toting, super-evolved apes as they roam the snowy Sierra Nevada foothills of the post-apocalyptic future, accompanied by a mute human girl, and <WSD>bear witness</WSD> to the strange cruelty of man. 
Meaning of the word marked with <WSD> tags:  To prove, demonstrate