Bradley Manning, or as he calls himself now, Chelsea Manning, was tortured and brutalized, simply for showing the world the various misdeeds of the US government and military. So yes, his treatment was cruel and inhumane, and we need to recognize the US government has no issue doing this to their own citizens.
Yes, Bradley Manning's treatment was cruel and inhumane as he was held without being charged with anything for a very, very long time. This means that his right to due process has been denied. Due process is included among the list of humane treatments, and thus if he has been denied this, he has been treated inhumanely.