 As the siege progressed, it was noted that Tartas was well defended and well supplied, and the English would likely not be able to take it before the stipulated 6 months.Charles II of Albret and his nephew John, Viscount of Lomagne (eldest son and heir of John IV, Count of Armagnac, another powerful nobleman in the region), attempted to raise the siege by ravaging nearby English lands, in particular the Chalosse and the lands of the Lord of Lescun (Rempston's lieutenant), which in turn included Coudures, Audignon, Sainte-Colombe, and Eyres.This did not deter the English from their objective, however, and the siege dragged on.