>>212324877
>some form of organizational structure
Which the south had in abundance. An insurrection, however, does NOT need the type of logistic support required to fight a conventional war.
>political assassination
>infrastructure sabotage
>shipping interference
>arson
>small scale raids
>propaganda campaigns
Very inexpensive compared to funding a conventional army and war, and a bigger pain in the ass for the North to deal with, as the insurgents are everywhere and nowhere at once.