Contact while moving was always possible. However, offensive action usually took two forms: either an attack on a camp or an ambush. The tactic for dealing with a camp was to get a party behind it then charge the front. However, ambushes were probably the most effective tactic and could be sustained for many days. They targeted tracks and, particularly in parts of Borneo, waterways. Track ambushes were close range, , with a killing zone typically long, depending on the expected strength of the target. The trick was to remain undetected when the target entered the ambush area and then open fire all together at the right moment.