In 1868 a law finally provided for the official abolishment of the demarcation statutes and the disabandonment of the fortifications proper. In 1856-58 the city gates were dismantled. These provisions did not apply to fortifications at Christianshavn and Kastellet. Christianshavn's ramparts were extended as late as 1868-1870 with a rampart along the east coast of the newly reclaimed Refshaleø, which only a few years later was rented out to the shipyard Burmeister & Wain. The fortifications at Christianshavn remained in use into the 20th century. Some areas were opened up in the late 1910s, and the last areas were not made public until 1961. The ramparts generally consisted of large earthworks with a ditch in front of it. As part of the improvements, numerous bastions were constructed along their course. In 1781, after extensive work on the fortifications in the preceding years, the bastions were given official names according to group: The bastions in Copenhagen were named for officers of note from the siege or other events of the early absolute era, the bastions at Christianshavn were named for powerful animals and at Kastellet. Since 1669, the bastions at Kastellet had been named for members of the Royal family and the King's lands. Nørrevold ran from Jarmers Tower to a site just east of Nørreport, at the junction of today's Gothersgade and Øster Voldgade. In connection with a modernisation of Vestervold in the 1660s, the ramparts were extended towards the south from Vesterport all the way to the coastline and into the water on reclaimed seabed. The extension included three new bastions, two of which were located on reclaimed land. Originally Østervold ran from a location just east of Nørreport along today's Gothersgade to Østerport's original location at the end of Østergade. As result of Christian IV's efforts to modernize the fortifications, the southern end of Østervold was continued around parts of Bremerholm. After the expansion of the fortified city in the 1650s, Østervold continued Nørrevold in a straight north-eastern direction, connecting the fortifications to the north side of Kastellet. The first Christianshavns Vold, constructed around 1620, had 4 and a half bastions.