The US Constitution defines treason in Article III, Section 3, Clause 1 this way: “Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort.”
In the matter of treason of domestic enemies in a time of war...
Who has standing to file/refer charges?
Who receives the charges?
Who mounts the investigation?
Who makes arrests?
Why tries the accused?
Did a search.
Arnold is inconsequential in this matter.
He was never tried.
He was sought, diligently, by the colonial military.