Article 10 required all prisoners to be exchanged without ransom although the Dutch later demanded reimbursement of their living expenses, which the English viewed as the same thing. After their failed 1666 coup, many Orangists sought refuge in England, with English and Scots dissidents going the other way. In Articles 13 and 17, both sides undertook not to protect each other's rebels; in a secret annex, the Dutch undertook to extradite regicides who voted for the Execution of Charles I in 1649, although in practice these provisions were ignored.