Gwilym ap Tudur Rhys and Owain Glyndŵr. As a result, the Tudur brothers began planning an attack on Conway Castle. On Good Friday, 1 April 1401, the brothers and 44 men (which included those who had also been excluded from the pardons) infiltrated the castle. They had pretended to be carpenters, and captured the castle while the guard were in church. Negotiations began for the return of the castle on 13 April, with the king represented by Henry "Hotspur" Percy and Gwilym representing the Welsh forces. After seeking a compromise, which would have resulted in pardons being given to the Welshmen, the king
Richard Beauchamp, 13th Earl of Warwick military action in Wales, defending against a Welsh rebellion led by Owain Glyndŵr. On 22 July 1403, the day after the Battle of Shrewsbury, he was made a Knight of the Garter. In the summer of 1404, he rode into what is today Monmouthshire at the head of a force. Warwick engaged Welsh forces at the Battle of Mynydd Cwmdu, near Tretower Castle a few miles northwest of Crickhowell – nearly capturing Owain Glyndwr himself, taking Owain's banner, forcing the Welsh to flee. They were chased down the valley of the River Usk where they regrouped and turned the tables