King of the Black Flag

While the Luohanjiao on land battled the Qing with broadswords and blood, the Black Ditch — the strait separating Taiwan from the mainland — entered its most chaotic and dramatic golden age. In the early nineteenth century, the Taiwan Strait was at once a golden corridor of merchant ships and rolling wealth, and a lawless blue wasteland beyond the reach of any government. Out of these storm-tossed seas rose a pirate king whose very name made the Qing Empire, Western powers, and merchant houses tremble: Cai Qian.

Cai Qian was born into desperate poverty in Tong'an, Fujian. Orphaned young, he survived as a cobbler, then as a dock laborer, witnessing the worst of human cruelty. With no path forward, he plunged into the Black Ditch and joined the pirates. With astonishing nerve, a precise mastery of winds and tides, and a leader's mix of generosity and ruthlessness, Cai Qian rapidly absorbed the strait's smaller pirate bands. By around 1800 he had built a vast maritime empire — over a hundred massive refitted warships and more than twenty thousand followers. His flagship was magnificent, even mounted with state-of-the-art Western bronze cannons bought from European smugglers, with firepower and range far exceeding the antiquated ships of the Qing navy. Unlike common bandits, Cai harbored grand political ambitions. He proclaimed himself "King of Subduing the Seas" and established his own reign title, official ranks, and laws. His fleet flew a great banner of black emblazoned with a golden phoenix tail. Any vessel crossing the Black Ditch had to pay heavy tribute to his bases in exchange for a personally signed "voyage tax certificate" — without it, ships were boarded, plundered, and their crews slaughtered.

At that time, Taiwan, rich from exports of tea, sugar, and rice, was in its "money up to the ankles" boom. The fertile western plains looked to Cai Qian like a perfect supply base and an inexhaustible source of plunder. To eliminate this threat to the empire's maritime defense, the Qing court in 1804 dispatched the most formidable naval commander in all of China — Li Changgeng, Admiral of the Zhejiang Navy — to wage a relentless cross-sea pursuit.

The climax of this duel between titans erupted off the Penghu Islands, a maze of treacherous reefs. It was a wooden-hulled showdown worthy of any modern Asian naval history. Using the monsoon winds, Li Changgeng led dozens of elite naval vessels into a narrow Penghu channel and surrounded Cai Qian's main fleet and flagship. At dawn the battle began; a furious northeast monsoon whipped up massive waves, the wooden hulls groaning and splintering. Both fleets pitched in the storm, cannon fire deafening, thick black smoke turning day into night across the strait.

In this carnage Cai Qian faced the gravest crisis of his life. His flagship, pinned by three Qing warships, lost its mast as blood ran on the decks. But he did not fight alone. His wife — known as "Mother Cai Qian" — was a legend in her own right, fearless and skilled in arms. Bloodied head to toe, she swung her broadsword at the bow and directed gunners through the rain of shot. Just as Li Changgeng's flagship, riding the wind, slammed into Cai's vessel and Qing marines prepared to board and seize him, Cai Qian showed his iron-cold composure as a pirate king. He pushed aside a wounded gunner, personally lit a Western cannon, and aimed it at Li's nearby ship. With a thunderous explosion, the shot struck Li Changgeng squarely in the throat. One of the Qing Empire's greatest naval commanders fell dead on his own deck. With Li gone, the Qing navy panicked; Cai seized the moment, broke through the encirclement, and vanished once more into the vast Black Ditch.

After killing Li Changgeng, Cai Qian's confidence reached its peak. In 1806 he set his sights on the commercial heart of central Taiwan — Lugang, then the second-greatest trading port on the island after Tainan.

Lugang was at that time the hub of Taiwan's bulk trade, packed with wealthy merchant houses. Cai Qian led over a hundred warships into Lugang's waters, the masts blanketing the coastline. His pirates landed in small sampans, intent on seizing the prosperous city. But Cai had underestimated his foe — not weak Qing soldiers, but Lugang's wealthy merchants and townspeople, ready to die defending their homes and fortunes.

Lugang's great merchants quickly funded a formidable civilian militia and recruited strong dock laborers. The city's layout suddenly proved decisive: the famous "Nine Turns Lane" was winding enough to block sea winds and disorient invading pirates, while the city's gated lanes served as natural fortresses. When pirates burst into the streets, militia and residents rained bricks and torches from rooftops, fighting brutal hand-to-hand battles in the narrow alleys.

Meanwhile, Qing reinforcements raced up from Tainan, and a naval relief fleet arrived offshore. Under cover of darkness, the Qing launched dozens of "fire ships" packed with straw and oil, riding the wind into Cai's fleet anchored in the shallows. Soon the Lugang waters became a sea of flame, the sky red with inferno. Seeing the city unyielding and his fleet under fire attack, Cai Qian read the shifting wind and made his iron decision. Abandoning his landing force, he took the helm himself, drove his remaining ships through a desperate breakout before the encirclement closed, and disappeared once more into the fog and waves of the Black Ditch.

Cai Qian's saga ended in 1809. After repeated failures, the Qing court finally assembled the combined naval might of Fujian and Zhejiang under the new Admiral Wang Delu and cornered Cai's remaining fleet off Wenzhou in eastern Zhejiang. The outcome was a foregone conclusion: Cai's ammunition and supplies were exhausted, his flagship riddled with holes. In the final moment, Wang Delu shouted for surrender, but the man who had ruled the Black Ditch for a decade displayed his last defiance. Refusing to be paraded to Beijing in chains like Zhu Yigui, Cai Qian fired one last cannon round at the Qing fleet, then walked into his ship's powder magazine. He lit the fuse and gave his wife a final, tragic smile.

A thunderous explosion shattered the sky. The flagship dissolved into countless splinters. The pirate king and his wife — along with a decade's worth of legendary treasure — sank together to the depths of the Black Ditch. With this final, absolute gesture, he closed the curtain on a life of extraordinary tumult.