The four knights and the esquire Cressingham should have their daggers privily ready under their cloaks and so they might very easily stab each of those guards in the back of the neck, and if they did that with skill they might slay them so peaceably that they would speak never a word. It was in that way that the Spaniards won the city of Amiens from the French a little later. If then those guards died without tumult the esquire Cressingham should go quietly to the within-side of the gateway and wave a little cloth up to those on the White Tower. If, on the other hand, they make a noise, that outcry in itself should serve for a signal. The danger of this enterprise was this, that if the Castle was at all diligently guarded there would be in the chamber above that gate a great company of archers under a captain, and if those guards should make an outcry the archers might very easily come down and work some mischief to those knights. Moreover, the herse or portcullis was worked from that upper chamber by means of pulleys and chains. Thus the archers there if they knew what was passing below might let down that portcullis and thus not only should they catch those knights like rats in a trap, but they should prevent others entering in. To guard against this the Young Lovell gave the following directions: In the first place, as soon as those guards were over-mastered or slain, one of the knights should close the door that let men down from the upper chamber. A very strong door it was, at the bottom of narrow steps, so that it would be no easy task to break through it. Thus, if those archers desired to come at those knights they must run along the battlements and down by the steps of the tower called de Insula, and that would take time. As for the portcullis, there was across the great gate a very strong and stout balk of wood, running in bolts. This they should take out and set upwards in the slots down through which the herse descended. Once that was there there should be no closing that way. This the Young Lovell knew very well, for once when he had been a boy he had done it out of devilment to plague the captain of the archers. Upon the sign from the esquire Cressingham, or upon hearing a tumult in the gate house, the Young Lovell, from the top of the White Tower, should fire cannon shots into that Castle, and the firing of those shots should serve a double purpose. In the first place they should be for a signal to all the others to go forward; in the second, they should serve to frighten and distract the archers in that upper chamber if that were necessary.