At the opening of 1414 a secret order summoned the Lollards to assemble in St.Giles's Fields outside London.

We gather, if not the real aims of the rising, at least the terror it caused, from Henry's statement that its purpose was "to destroy himself, his brothers, and several of the spiritual and temporal lords"; from Cobham's later declarations it is probable that the pretext of the rising was to release Richard, whom he asserted to be still alive, and to set him again on the throne.

But the vigilance of the young king prevented the junction of the Lollards within the city with their confederates without, and these as they appeared at the place of meeting were dispersed by the royal troops.
[Sidenote: Renewal of the French War] The failure of the rising only increased the rigour of the law.
Magistrates were directed to arrest all heretics and hand them over to the bishops; a conviction of heresy was made to entail forfeiture of blood and estate; and the execution of thirty-nine prominent Lollards as traitors gave terrible earnest of the king's resolve to suppress their sect.
Oldcastle escaped, and for four years longer strove to rouse revolt after revolt.

He was at last captured on the Welsh border and burned as a heretic; but from the moment when his attempt at revolt was crushed in St.
Giles's Fields the dread of Lollardry was broken and Henry was free to take a more energetic course of policy on the other side the sea.

He had already been silently preparing for action by conciliatory measures, by restoring Henry Percy's son to the Earldom of Northumberland, by the release of the Earl of March, and by the solemn burial of Richard the Second at Westminster.