Meet John Deere H414 harvester. It has a head that can grab trees, cut them and then move them to another area where it can cut those trees to size.
It does this with fair simplicity and pretty fast. Just imagine what forces are in that head and see how it rips off the branches off of that tree.
Sploid, from Gizmodo, has more video with such monster wood cutting machines. Just imagine how it would be to have such exoskeletons in the wars of the future.