By this scrupulous fidelity the prince acquired the confidence of all parties, and was afterwards enabled to recover fully the royal authority, and to perform such great actions both during his own reign and that of his father.
The situation of England, during this period, as well as that of most European kingdoms, was somewhat peculiar.

There was no regular military force maintained in the nation: the sword, however, was not, properly speaking, in the hands of the people; the barons were alone intrusted with the defence of the community; and after any effort which they made, either against their own prince or against foreigners, as the military retainers departed home, the armies were disbanded, and could not speedily be reassembled at pleasure.

It was easy, therefore, for a few barons, by a combination, to get the start of the other party, to collect suddenly their troops, and to appear unexpectedly in the field with an army, which their antagonists, though equal or even superior in power and interest, would not dare to encounter.

Hence the sudden revolutions which often took place in those governments; hence the frequent victories obtained without a blow by one faction over the other; and hence it happened, that the seeming prevalence of a party was seldom a prognostic of its long continuance in power and authority.
{1262.} The king, as soon as he received the pope's absolution from his oath, accompanied with menaces of excommunication against all opponents, trusting to the countenance of the church, to the support promised him by many considerable barons, and to the returning favor of the people, immediately took off the mask.

After justifying his conduct by a proclamation, in which he set forth the private ambition and the breach of trust conspicuous in Leicester and his associates, be declared that he had resumed the government, and was determined thenceforth to exert the royal authority for the protection of his subjects.
* M.Paris.