sentences:  Mary was placed under strict confinement at Chartley Hall in Staffordshire, while Walsingham and Lord Burghley drew up the Bond of Association, obliging all signatories to execute anyone who attempted to usurp the throne or to assassinate the Queen.Mary herself was one of the signatories and it provided the basis for her execution following the 1586 Babington Plot.Many participants in the Babington and Gunpowder Plots were related by blood or marriage to Francis, among them Robert Catesby and Francis Tresham.