Berwick was captured, and its governor and several knights executed.
Escaping from Scotland, where he feared that he might be seized and surrendered to England, the earl sailed to Wales, and for some little time stayed with Glendower; then he crossed to the Continent, and in 1408 landed in Yorkshire and again raised his standard.

The sheriff of the county called out the levies, and attacked him at Branham Moor, where the old earl was killed and his followers defeated.
In 1415 the king, being on the eve of war with France, and anxious to obtain the goodwill and support of the Northumbrians, restored Hotspur's son, who had been for years a fugitive in Scotland, to the estates and honours of his father and grandfather.
Fortunate it was, for Oswald, that the capture of his fellow conspirators caused the earl to retreat, in 1405, without giving battle.

The young knight had, at his summons, called out his tenants, and with them and his retainers had joined Percy.

As soon as the latter decided to fly to Scotland, his force scattered, and Oswald returned home with his following.
He took no part in the final rising.

Before this took place he had married his cousin, Janet.