No he didn't at all, you've just made that up, he provided legal clarification for free, he prosecuted no one.
Plus not a single soldier who served in Iraq was ever prosecuted, only the lawyer, Shiner, who the Tories did nothing about for many years.
In 2010, less than 100 investigations into Iraqi possible war crimes... by 2017, under the Tories, it was 2500....
Prosecutions for Bloody Sunday was also done and started under the Tories... same with SF in Afghanistan too.