The Portuguese forces launched Process_start a direct assault on the town , hoping initially to capture a key fort , San Cristóbal , but after 22 days of unsuccessful attack , the Portuguese abandoned GiveUp this plan and began Process_start to build a circumvallation wall around Badajoz instead , to try to isolate the city .

During the siege Besieging , a-16 kilometer-long circumvallation line was made Manufacturing around Grol in order to prevent Preventing_or_letting the enemy from leaving Departing and to prevent Preventing_or_letting liberation of the city from the outside .