In the late 16th century, Japanese traders in the Philippines engaged in exchanges of gold and silver under Spanish oversight. By 1580, pirate bands known as Wokou—comprising Japanese, Chinese, and Filipino members¹—began raiding the Cagayan region, threatening local settlements and Spanish trade routes. These groups were loosely organized and operated from small ships, including at least one junk and several smaller sampans- 18 are reffered- armed with swords, spears, and small firearms.

To suppress the raids, Governor-General Gonzalo Ronquillo commissioned Juan Pablo de Carrión. Carrión assembled a force of 40–60 Spanish soldiers, including rodeleros (shield-bearers trained for close combat) and arquebusiers, supported by seven ships: five small support vessels, a light ship (San Yusepe), and a galley (La Capitana). This contingent was tasked with confronting the Wokou along the coast and upriver along the Cagayan River.

Engagements occurred near Cape Bojeador and along the river. Spanish troops boarded enemy vessels, fought in close quarters, and employed combined infantry and firearm tactics. Contemporary letters describe that the Spanish successfully repelled pirate attacks, causing many Wokou to abandon their ships, some drowning in the process due to the weight of armor. The Spanish forces then continued upriver, encountering additional pirate vessels and a small inland fort. Spanish soldiers landed, dug defensive positions, and used artillery to weaken enemy positions. As the fighting continued, Spanish gunpowder supplies reportedly became limited, shifting the engagement toward closer-range combat. Eventually, as the intensity of the assaults declined, the Spanish forces left their defensive positions and counterattacked, forcing the attackers to withdraw and ending the immediate fighting.

Ronquillo wrote to King Philip II on 16 June 1582:

Los japoneses son la gente más belicosa que hay por acá. Traen artillería y mucha arcabucería y piquería. Usan armas defensivas para el cuerpo. Lo cual todo lo tienen por industria de portugeses, que se lo han mostrado para daño de sus ánimas.

The Japanese are the most belligerent people here. They bring artillery and many arquebusiers and pikemen. They wear body armor. All provided from the works of the Portuguese, whom they have shown to them for the detriment of their souls

Weapons captured from the pirates included swords, armor, and small firearms. Contemporary letters by Juan Bautista Román (June 25, 1582) and Gonzalo Ronquillo (July 1582), preserved in The Project Gutenberg Book of the Philippine Islands, 1493–1803, Volume V, confirm that Spanish forces suffered minimal casualties and successfully suppressed the Wokou threat in the Cagayan region.

This conflict illustrates the effectiveness of Spanish military organization and European weaponry, including Toledo steel swords, against the irregular pirate forces of East and Southeast Asia. While later accounts often exaggerate pirate numbers and describe dramatic battlefield events, the verified historical record emphasizes the Spanish expedition’s success in ending the raids along the Cagayan River.

Sources:
The Philippine Islands, 1493-1803 — Volume 05 of 55 by Blair, Bourne, and Robertson

“Filipinas 1582: La victoria sobre los piratas japoneses de Cagayán (II)

1. According to the History of Ming, in a 1555 wokou raiding party, 30% of the wokou were ethnic Japanese, and 70% were Han Chinese. According to Censor Du Zhonglu, in a memorial dated 1553, the pirates were 10% barbarian people, 20% Ryukyuans, and the rest from Fujian and Ningbo areas of China. ↩︎