It's an ingenious strategy to fill your prisons so full of enemy soldiers, that you run out of places to put them, causing a crisis in the prison system budget. Eventually the financial strain of housing them will bankrupt you, you'll have to set them all free. The released prisoners will then rise up and takeover the entire realm all at once.
Pure genius.
Exactly, but to off-set those expenses we'll just take the gold that all of those nobles are carrying and use it to buy a bunch of gallows. Problem solved.
