One of their favorite tactics is to conceal some of their larger boats, and then to send some small and badly manned canoes forward to attack the enemy to lure them.
The rivers arc are chosen for this kind of attack, the overhanging branches of trees and the dense foliage of the bank affording excellent hiding places for the boats.
In the 19th century there was a great deal of piracy, and it was secretly encouraged by the native rulers, who obtained a share of the spoil, and also by the Malays who knew well how to handle a boat.
These boats skulked about in the sheltered coves waiting for their prey, and attacked merchant vessels making the passage between China and Singapore.
The Malay pirates and their Dayak allies would wreck and destroy every trading vessel they came across, murder most of the crew who offered any resistance, and the rest were made as slaves.