When the Manchus retook the Imperial throne and thus founded the Ming dynasty in the second half of the 14th century, the early Ming emperors inherited much of the Yuan maritime technology and policy. There were huge ocean-going warships, large ocean capable cargo ships, a regular coastal grain delivery system transporting grain from the southern provinces to the northern ones, and considerable foreign contacts, primarily in south east Asia but extending to Ceylon and India. However, two other dynamics were at work. First, the Ming dynasty was continually working to restore her native culture after a century-long of foreign rule.16 The Grand Canal, initially completed during the Sui dynasty (6th century AD), with a vast remodelling and extension to the new northern capital at Peking during the Yuan (13th century), was initially in disrepair due to the extensive conflict between the Yuan and Ming. The early Ming saw the rebuilding and improvement of the Grand Canal and other canals, paved highways, bridges, defenses, temples, shrines and walled cities.17 Second, the Ming administration was being restructured, with a resurgence of Confucian scholars as senior officials and a great development in the use of eunuchs in high office as well.18 These two categories of high officials were in considerable conflict throughout the Ming period. The Confucians were generally ascendant, but during the rule of the third Ming Emperor, Zhu Di, the eunuch administrators and warriors were greatly trusted and given great power. This was largely because Zhu Di was a rebel warrior prince who usurped the throne of his nephew, with an initial power base purely in the north. Many of the government ministers disapproved of his usurpation early in his reign, so Zhu Di preferred to entrust eunuchs with a large share of the business of government. Many of the eunuch administrators had been loyal retainers to Zhu Di in the frontier wars and the rebellion for decades, whereas the Confucian administrators and warrior princes had defended the old, recently defeated regime.19
In the case of the Ming Indian Ocean expeditions, the Emperor Zhu Di chose as his agent and leader of the expeditions the eunuch Admiral Zheng He. Born 1372 into a Muslim family named Ma in Yunnan, he was taken at age ten into the Ming service, and subsequently castrated at age thirteen and placed into the household of the twenty-five year old Prince of Yan, Zhu Di, the fourth son of the first Ming emperor. Over the next ten years, from Yunnan to the northern frontier, Ma He (who was to be given the name Zheng He when the prince became emperor) served in the field doing frontier defense with Prince Zhu Di. The large, commanding and battle experienced eunuch distinguished himself during Prince Zhu Di's bid for the throne, in both the 1399 defense of Beiping and the final campaign of 1402 to capture Nanjing.20
In 1403 the new emperor Zhu Di issued orders to begin construction of an imperial fleet of warships and support ships to visit ports in the China seas and the Indian Ocean. The Ming Tong Jian, an unofficial history of the period, says: Regarding the Jianwen emperor's escape, there are some who say he is abroad. The emperor ordered Zheng He to seek out traces of him.21 The fleet was larger than required to reopen trade with the southern and western regions, but such magnificence might well convince any foreign ruler harboring the deposed Chinese emperor of Zhu Di's strength. And foreign trade, such as that which had occurred fifty years previously under the Yuan dynasty, might well help a treasury depleted by a long civil war.22 An imperial history compiled in 1767, the Li-Tai Thung Chien Chi Lan (Essentials of the Comprehensive Mirror of History), states: In the third year of the Yung-Lo reign-period [Zhi Di's dynastic title, 1405], the Imperial Palace Eunuch Zheng He was sent on a mission to the Western Oceans. The emperor [Zhu Di], under the suspicion that (his nephew) the (previous) emperor might have fled beyond the seas, commissioned Zheng He, Wang Ching-Hung and others, to pursue his traces. Bearing vast amounts of gold and other treasures, and with a force of more than 37,000 officers and men under their command, they built great ships and set sail from...the prefecture of Suchow, whence they proceeded by way of Fukien to Chan-Chheng (Indo-China), and thence on voyages throughout the western seas....Every country became obedient to the imperial commands, and when Zheng He turned homewards, sent envoys in his train to offer tribute.....Zheng He was commissioned on no less than seven diplomatic expeditions, and thrice made prisoners of foreign chiefs.....At the same time, the different peoples, attracted to the profit of Chinese merchandise, enlarge their mutual intercourse for purposes of trade, and there was uninterrupted going to and fro.23
At the time of the Ming Indian Ocean voyages, Chinese ocean-going technology was somewhat superior to the European, with the exception of navigation. In ship size, the Chinese had by far the larger ships. The largest ships of the Zheng He expeditions were about 500 feet long. The dimension of the ships given in Chinese histories was always subject to the accusation of exaggeration. However, in 1962, an actual rudder post of one of Zheng He's treasure ships was discovered at the site of one of the Ming shipyards near Nanking. This timber was 36.2 feet long, and when reverse engineered to typical proportions, this yields a ship length of 480 to 536 feet, depending upon different assumptions about the draught.24 In comparison, the ocean-going European ships of this period were considerably smaller, more typically 100 feet long (i.e. 1500 tons for Zheng He and perhaps 300 tons for the Portuguese explorers). The Chinese had been using multi-masted ships for several centuries, while the Portuguese had just in the past century developed this innovation with their new, secret design caravel. In compartmentation, the Chinese had a clear advantage, with large ships of up to thirteen watertight compartments for centuries prior the period of examination. Western ships were not provided with watertight compartments until the middle of the 19th century, after reports of Chinese compartmentation illuminated the advantages in surviving a hole in the ship's hull.25 In sail technology, the Europeans had long sufficed with square sail rigs on their ocean vessels (while with some lateen rigs on smaller ships since the 3rd century), which were good running before the wind but unhandy in beating upwind. The Chinese had been using fore-and-aft lugsails (more efficient in beating upwind) since the 3rd century AD, and since the 9th century in ocean-going ships, and were thus long able to steer closer to the wind.26