"...an example of some other hard-hitting investigative reporting he did?"

Peter...he wasn't trying to be an 'investigative' reporter. He was a war correspondent and a 'basic' reporter. He was in Europe in WWII and in Viet Nam...etc... he could easily have been a statistic. THAT needed doing as much as investigative stuff needed doing. It's a different mindset.

He prided himself on NOT interjecting his own opinion into most stories so he could report with impartiality.

He set a standard for honesty.