The law of war is a body of law concerning acceptable justifications to engage in war (jus ad bellum) and the limits to acceptable wartime conduct (jus in bello or International humanitarian law). The law of war is considered an aspect of public international law (the law of nations) and is distinguished from other bodies of law, such as the domestic law of a particular belligerent to a conflict, that may also provide legal limits to the conduct or justification of war.

Amongst other issues, modern laws of war address declarations of war, acceptance of surrender and the treatment of prisoners of war; military necessity, along with distinction and proportionality; and the prohibition of certain weapons that may cause unnecessary suffering.

Attempts to define and regulate the conduct of individuals, nations, and other agents in war and to mitigate the worst effects of war have a long history. The earliest known instances are found in the Hebrew Bible (Old Testament). For example, Deuteronomy 20:19-20 limits the amount of acceptable collateral and environmental damage:

Jensen Ross Ackles (born March 1, 1978) is an American actor and director. He is known for his roles in television as Eric Brady in Days of our Lives, which earned him several Daytime Emmy Award nominations, as well as Alec/X5-494 in Dark Angel and Jason Teague in Smallville. Ackles currently stars as Dean Winchester on the CW series Supernatural.

Ackles was born in Dallas, Texas, the son of Donna Joan (née Shaffer) and Alan Roger Ackles, an actor. Ackles has a brother, Joshua, who is three years older, and sister, Mackenzie, who is seven years younger. He is of English, Irish and Scottish ancestry. He had planned to study sports medicine at Texas Tech University and become a physical therapist but instead moved to Los Angeles to start his acting career.

After modelling on and off since the age of 4, Ackles began to concentrate on an acting career in 1996. He appeared in several guest roles on Mr. Rhodes, Sweet Valley High, and Cybill before joining the cast of the NBC soap opera Days of our Lives as Eric Brady in 1997. He won a 1998 Soap Opera Digest Award for Best Male Newcomer and went on to be nominated three times (in 1998, 1999, and 2000) for a Daytime Emmy Award for Outstanding Younger Actor in a Drama Series for his work on Days of our Lives.