By this crisis and its manner of resolution two principles had been established from which important consequences flowed. One was that the King had no right to despatch the feudal host wherever he might choose. This limitation sounded the death-knell of the feudal levy, and inexorably led in the following century to the rise of indentured armies serving for pay. The second point of principle now recognised was that the King could not plead “urgent necessity” as reason for imposing taxation without consent.

Winston Churchill, A History of the English-Sp…, loc. 461