Edward, a relatively moderate royalist, was away from Knole in the summer of 1642, when he and his cousin and factotum Sir John Sackville fell under suspicion of stockpiling arms and preparing local men to fight for Charles I during the Civil War. The rumours of the cache of arms reached Parliament in an intercepted letter for which Sir John was notionally the source. On Sunday 14 August 1642, Parliament sent three troops of horse under Colonel Edwin Sandys, a member of a Kentish puritan family, to seize these arms from Knole. Sir John was in the congregation for the parish Sunday service and Sandys waited with his troops outside the church until it had finished. Local people tried to rescue him but they quickly judged that the troops were too strong for them, and Sir John was arrested and taken to the Fleet prison.