The Terracotta Army: Chinas Underground Imperial Guard

Farmers, a Well, and an Accidental Discovery

In March 1974, a group of farmers digging a well near Xi'an in Shaanxi Province struck something hard beneath the dry loess soil. They pulled up fragments of a clay figure. Local authorities were notified. Within weeks, archaeologists arrived and began uncovering what would become one of the most significant archaeological finds of the 20th century: an underground army of terracotta soldiers guarding the tomb of China's first emperor.

The site lies roughly 1.5 kilometers east of Emperor Qin Shi Huang's burial mound. Excavations have continued for over five decades and remain incomplete. Estimates suggest that only about one-third of the three main pits has been fully excavated.

The Emperor Who United China

Qin Shi Huang ascended to the throne of the Qin state at age 13 in 246 BCE. By 221 BCE, he had conquered six rival kingdoms and unified China under a single imperial government. His reign lasted just 11 years, but its effects shaped Chinese civilization for millennia.

He standardized weights, measures, currency, and the writing system. He ordered the construction of roads and canals. He connected existing defensive walls into what became the precursor of the Great Wall. He was also ruthless. Dissent was crushed. Books were burned. Scholars were buried alive.

Three Pits, Thousands of Figures

The terracotta army occupies three major pits covering approximately 22,000 square meters. Pit 1, the largest, measures 230 meters long and 62 meters wide. It contains an estimated 6,000 warriors arranged in battle formation. Pit 2 holds cavalry, infantry, and war chariots in a more complex tactical arrangement. Pit 3, the smallest, appears to represent a command post with 68 high-ranking officer figures.

A fourth pit was discovered but found empty. Scholars believe construction was abandoned, possibly due to the civil unrest that erupted after the emperor's death in 210 BCE.

• Total estimated figures across all pits: over 8,000 soldiers, 130 chariots, 520 chariot horses, and 150 cavalry horses
• Each warrior stands between 175 and 200 centimeters tall, slightly larger than the average man of that era
• No two faces are identical, with variations in facial features, hairstyles, and expressions
• Warriors originally held real bronze weapons, many of which were looted after the Qin Dynasty fell

How Were They Made?

Construction of the terracotta army likely began around 246 BCE, when Qin Shi Huang first took the throne. An estimated 700,000 laborers worked on the emperor's entire mausoleum complex, though the exact number dedicated to the terracotta figures remains unknown.

The warriors were not sculpted as single pieces. Craftsmen used a modular assembly system. Legs, torsos, arms, and heads were made separately from local clay, then assembled and refined with individual details. Ears, mustaches, and armor plates were added by hand. Each figure was then fired in a kiln at temperatures around 1,000 degrees Celsius.

Original Colors Lost to Time

The figures appear gray today. They were not always so plain. When first excavated, traces of vivid paint clung to the surface: red, green, blue, purple, and yellow pigments made from minerals and plant extracts. Exposure to air caused the lacquer base layer to curl and flake within minutes of excavation. This color loss prompted archaeologists to develop new preservation techniques before continuing work.

Weapons That Defied Corrosion

Archaeologists recovered over 40,000 bronze weapons from the pits. Swords, crossbow triggers, spearheads, and arrowheads emerged in remarkable condition. Some blades remained sharp enough to cut paper after more than 2,000 years underground.

Analysis revealed a thin chromium oxide layer on many weapons. This coating, whether intentional or a byproduct of the manufacturing process, had prevented corrosion. Chrome plating as an industrial technique was not developed in the West until 1924. The discovery sparked debate about whether Qin-era metallurgists understood anti-corrosion chemistry.

• Crossbow triggers were manufactured with interchangeable parts, suggesting early standardized production
• Arrowheads contained precise tin-to-lead ratios for optimal hardness
• Some swords measured over 90 centimeters, unusually long for the period
• Bronze chariot fittings showed evidence of gold and silver inlay work

The Unexcavated Tomb

The emperor's actual burial chamber remains sealed beneath a 76-meter-tall earthen mound. Ancient historian Sima Qian, writing about a century after the emperor's death, described a subterranean palace with rivers of mercury simulating the empire's waterways, a ceiling adorned with pearls representing stars, and crossbow traps set to kill intruders.

Modern soil testing has detected mercury levels up to 100 times higher than normal around the mound, lending credibility to Sima Qian's account. Chinese authorities have declined to excavate, citing insufficient technology to preserve whatever lies within. The decision reflects a cautious approach shaped by the paint-loss disasters of earlier terracotta excavations.

A UNESCO Site Drawing Millions

The Terracotta Army was designated a UNESCO World Heritage Site in 1987 as part of the Mausoleum of the First Qin Emperor. The on-site museum, formally called the Emperor Qin Shi Huang's Mausoleum Site Museum, attracts over 5 million visitors annually.

Ongoing excavations continue to reveal new finds. In 2022, archaeologists announced the discovery of previously unknown painted figures with better-preserved pigments. Advanced techniques including 3D scanning, spectral imaging, and controlled-atmosphere excavation chambers are being employed to protect fragile surfaces during extraction. The army beneath Xi'an still has secrets left to yield.