Lion, surprised by the English under cover of a mist, fell into the hands of Henry's minister, Ranulf de Glanvill, and at the retreat of the Scots the English rebels hastened to lay down their arms. With the army of mercenaries which he had brought over sea Henry was able to return to Normandy, to raise the siege of Rouen, and to reduce his sons to submission. [Sidenote: Later reforms] Through the next ten years Henry's power was at its height. The French king was cowed. The Scotch king bought his release in 1175 by owning Henry's suzerainty. The Scotch barons did homage, and English garrisons manned the strongest of the Scotch castles. In England itself church and baronage were alike at the king's mercy. Eleanor was imprisoned; and the younger Henry, though always troublesome, remained powerless to do harm. The king availed himself of this rest from outer foes to push forward his judicial and administrative organization. At the outset of his reign he had restored the King's Court and the occasional circuits of its justices; but the revolt was hardly over when in 1176 the Assize of Northampton rendered this institution permanent and regular by dividing the kingdom into six districts, to each of which three itinerant judges were assigned. The circuits thus marked out correspond roughly with those that still exist. The primary object of these circuits was financial; but the rendering of the king's justice went on side by side with the exaction of the king's dues, and this carrying of justice to every corner of the realm was made still more effective by the abolition of all feudal exemptions from the royal jurisdiction. The chief danger of the new system lay in the opportunities it afforded to judicial corruption; and so great were its abuses, that in 1178 Henry was forced to restrict for a while the number of justices to five, and to reserve appeals from their court to himself in council. The Court of Appeal which was thus created, that of the King in Council, gave birth as time went on to tribunal after tribunal. It is from it that the judicial powers now exercised by the Privy Council are derived, as well as the equitable jurisdiction of the Chancellor. In the next century it became the Great Council of the realm, and it is from this Great Council, in its two distinct capacities, that the Privy Council drew its legislative, and the House of Lords its judicial character. The Court of Star Chamber and the Judicial Committee of the Privy Council are later offshoots of Henry's Court of Appeal. From the judicial organization of the realm, he turned to its military organization, and in 1181 an Assize of Arms restored the national fyrd or militia to the place which it had lost at the Conquest. The substitution of scutage for military service had freed the crown from its dependence on the baronage and its feudal retainers; the Assize of Arms replaced this feudal organization by the older obligation of every freeman to serve in defence of the realm.