On 24 October 1411 the king's council issued orders for the Constable of the Tower or his lieutenant to receive Cokayne into custody, together with several other Derbyshire and Nottinghamshire knights. Cokayne's imprisonment coincided with apparent triumph of the faction headed by the Beauforts and the Prince and their policy of engagement in the Armagnac–Burgundian Civil War. Only two days earlier an English expedition had accompanied John the Fearless, the Duke of Burgundy, in taking Paris. However, it is unlikely Cokayne was the victim of a political purge, as Leche was included with him in the round-up. Neither headed the list: rather it was Thomas Chaworth, who had been involved in a violent feud with Sir Walter Tailboys. Then came Richard Stanhope and John Zouche, who had a bitter property dispute of their own, which also involved John Leek, who completed the list. John Finderne was added by a separate letter. The imprisoned knights may all have been involved in the quarrel between Cokayne and Leche or the internecine Lancastrian rivalries but the principle of selection may simply have been one of removing gentry miscreants temporarily from the region. On 6 November the constable was informed of arrangements for the trial of the imprisoned men and not until 30 November, after they had been kept out of circulation for more than five weeks, was their release ordered.