In late June 1460, Warwick, Salisbury, and Edward of March crossed the Channel, making landfall in Sandwich and rode north to London, where they enjoyed widespread support. Salisbury was left with a force to besiege the Tower of London, while Warwick and March pursued Henry northward. The Yorkists caught up with the Lancastrians and defeated them at Northampton on 10 July 1460. During the battle, at the Lancastrian left flank, commanded by Lord Grey of Ruthin changed sides and simply let the Yorkist inside the fortified position. The Duke of Buckingham, the Earl of Shrewsbury, the Viscount Beaumont, and the Baron Egremont were all killed defending their king. For a second time, Henry was taken prisoner by the Yorkists, where they escorted him to London, compelling the surrender of the Tower garrison.