section: Walls and gates
question: How were the walls built with the intended purpose for batle?
article: Forbidden City
candidates: The Forbidden City is surrounded by a high city wall and a deep by wide moat. The walls are wide at the base, tapering to at the top. These walls served as both defensive walls and retaining walls for the palace. They were constructed with a rammed earth core, and surfaced with three layers of specially baked bricks on both sides, with the interstices filled with mortar. At the four corners of the wall sit towers (E) with intricate roofs boasting 72 ridges, reproducing the Pavilion of Prince Teng and the Yellow Crane Pavilion as they appeared in Song dynasty paintings. These towers are the most visible parts of the palace to commoners outside the walls, and much folklore is attached to them. According to one legend, artisans could not put a corner tower back together after it was dismantled for renovations in the early Qing dynasty, and it was only rebuilt after the intervention of carpenter-immortal Lu Ban. The wall is pierced by a gate on each side. At the southern end is the main Meridian Gate (A). To the north is the Gate of Divine Might (B), which faces Jingshan Park. The east and west gates are called the "East Glorious Gate" (D) and "West Glorious Gate" (C). All gates in the Forbidden City are decorated with a nine-by-nine array of golden door nails, except for the East Glorious Gate, which has only eight rows. The Meridian Gate has two protruding wings forming three sides of a square (Wumen, or Meridian Gate, Square) before it. The gate has five gateways. The central gateway is part of the Imperial Way, a stone flagged path that forms the central axis of the Forbidden City and the ancient city of Beijing itself, and leads all the way from the Gate of China in the south to Jingshan in the north. Only the Emperor may walk or ride on the Imperial Way, except for the Empress on the occasion of her wedding, and successful students after the Imperial Examination.