Glyndŵr sought help from Henry IV to deal with his land being taken, but Henry refused to take action against his supporters. Glyndŵr also failed to supply soldiers to the king for another attack on Scotland. Grey called him a traitor. Glyndŵr decided to take action against Henry IV. He gave himself the title of Prince of Wales in September 1400, and began a series of attacks against Grey and towns along the borders with England. Henry IV sent his army to Wales to fight Glyndŵr and regain control, but it had the opposite effect. It became a widespread rebellion against England.