Principles of warfare are the evolved concepts, laws, rules and methods that guide the conduct of combat related activities during conflicts. Throughout history, soldiers, military theorists, political leaders, philosophers, academic scholars, practitioners of international law and human rights advocacy groups have sought to determine fundamental rules for the conduct of warfare. Principles of warfare impact on the health and security of civilian populations in a zone of conflict, human and natural environment, social networks and groups, rural and urban societies, national and international economic relations, political structures and international diplomacy, and the means and methods by which conflicts are brought to conclusion. These approaches have been both prescriptive, stating what activities are forbidden in warfare by law, ethical considerations, or religious beliefs, and descriptive, analyzing the best practices and means by which armed forces can achieve victory.
The Book of Deuteronomy prescribes how the Israelite army was to fight, including dealing with plunder, enslavement of the enemy women and children and forbidding the destruction of fruit-bearing trees.
The Hague and Geneva Conventions
See: Hague Conventions, Geneva Conventions
20th century issues
There are several issues where appropriate the laws of land warfare are ambiguous or obsolescent. Among these are the use of private contractors as soldiers or private armies and whether they are mercenaries or not under international conventions.
In addition, several classes of weapons, such as land mines or cluster bombs, have been decried by non-governmental organizations and some governments as inherently inhumane. However, the United States has refused to denounce the use of these weapons. In the case of land mines, the U.S. position is that all U.S.-planted mines are clearly marked and mapped, and that all U.S.-planted mines can be deactivated by remote command. The People's Liberation Army also continues to use land mines.