Search and Destroy, Seek and Destroy, or even simply S&D, refers to a military strategy that became a large component of the Malayan Emergency and the Vietnam War. The idea was to insert ground forces into hostile territory, search out the enemy, destroy them, and withdraw immediately afterward. The strategy was the result of a new technology, the helicopter, which resulted in a new form of warfare, the fielding of air cavalry, and was thought to be ideally suited to counter-guerrilla jungle warfare. The complementary conventional strategy, which entailed attacking and conquering an enemy position, then fortifying and holding it indefinitely, was known as "clear and hold" or "clear and secure." In theory, since the traditional methods of "taking ground" could not be used in this war, a war of attrition would be used, eliminating the enemy by the use of "searching" for them, then "destroying" them, and the "body count" would be the measuring tool to determine the success of the strategy of "search and destroy."
The British conducted search and destroy operations in effort to flush out communist insurgents in the jungles during the early years of the Malayan Emergency. The Ferret Force, which was formed in 1948, became an important intelligence provider to the British military. The objective was to contact with native locals and intelligence as to the whereabouts of communist insurgents. With the information the captured persons provided, British troops would use search and destroy as a tactic in effort to flush out the insurgents. Once the communist guerrillas had been flushed out by search and destroy missions, they would be harried by denial of food and medical supplies, perhaps by surrendered enemy personnel willing to cooperate with the British, and eventually induced to surrender, tempted into betrayal, or killed off by a precise military strike, usually an ambush.
In the end, many British officials suspected that the search and destroy didn't work out well because the way it was conducted was in a brutalized way. British troops often set fire to villages accused of supporting the insurgents, detaining thousands of suspected collaborators, and in order to deny the insurgents cover. British units that discovered civilians providing assistance to insurgents were to detain and interrogate them to discover the location of insurgent camps. Insurgents had numerous advantages over British forces; they lived in closer proximity to villagers, they sometimes had relatives or close friends in the village, and they were not afraid to threaten violence or torture and murder village leaders as an example to the others, forcing them to assist them with food and information. British forces thus faced a dual threat: the insurgents and the silent network in villages who, willingly or unwillingly, supported them. While the insurgents rarely sought out contact with British forces, they did use terrorist tactics to intimidate civilians and elicit material support. British troops often described the terror of jungle patrols; in addition to watching out for insurgent fighters, they had to navigate difficult terrain and avoid dangerous animals and insects. Many patrols would stay in the jungle for days, even weeks, without encountering the enemy and then, in a brief moment, insurgents would ambush them. British forces, unable to distinguish from friend to foe, had to adjust to the constant risk of an insurgent attack. These instances led to the infamous incident at Batang Kali where 24 unarmed villagers were killed by British troops.