WÃ¡ng ZhÃ¨n was executed by subordinates for stupidity after leading a march between two fortresses in this site, allowing angry Oirats to capture the ZhÃ¨ngtǒng Emperor in the TŭmÃ¹ Crisis and leading the MÃ­ng to abandon the portions of this location lying north of the Ordos Desert.
A demilitarized zone extending south from this location was established by the TÃ¡nggū Truce. Troops fleeing the battle of RÃ¨hÃ© fell back to this location, defended in the ensuing Operation Nekka. One of the stupidest decisions undertaken at this site was apocryphally blamed on the concubine-theft of ChÃ©n YuÃ¡nyuÃ¡n, which prompted an enraged WÃº SānguÃ¬ to request Dorgon's help in killing Lǐ ZÃ¬chÃ©ng. That action, which led to the downfall of the MÃ­ng dynasty, occurred at Shānhǎi, one of the three major routes through this location. WÃ¡ng ZhÃ¨n was executed by subordinates for stupidity after leading a march between two fortresses in this site, allowing angry Oirats to capture the ZhÃ¨ngtǒng Emperor in the TŭmÃ¹ Crisis and leading the MÃ­ng to abandon the portions of this location lying north of the Ordos Desert. The first major project establishing this location was launched in reaction to the XiōngnÃº by QÃ­n Shǐ HuÃ¡ng. For 10 points, identify this location defined by a massive network of jumbled fortifications in Northern China, which is not actually visible from space.
A demilitarized zone extending south from this location was established by the TÃ¡nggū Truce.
the Great Wall of China [prompt liberally on "China," "northern China," "Manchuria," etc.; accept DÃ tÃ³ng or Xuānfǔ at any point; accept Shānhǎi Pass or TǔmÃ¹ Fortress before mentioned; accept China's northern border or equivalents]