Islamic military jurisprudence
Abd al-Aziz Bin Baz, late 19th AD Grand Mufti of Saudi also supported Ibn Taymiyyah fatwa and issued his own fatwa with similar ruling on the basis Zubayr conduct of interrogating Kenana. Ibn Baz highlighted Zubayr conduct were acknowledged and permitted by Muhammad, as Kenana was one of Jewish conspirator in Khaybar. This criminal interrogation procedure exacted by Zubayr towards Kinana were also highlighted by other prominent scholars, such as Ahmad ibn Muhammad al-Thalabi in his work, Tafsir al-Tha'labi
Shafiʽi school madhhab highlighted another case that were used in Ijma (consensus among scholars) to permit the interrogations towards enemy of the state were including the case when Ali ibn Abi Talib and Zubayr once threaten a polytheist informant spy who are being caught by the 2 Sahabah during the spy journey to inform Mecca about Muslims secret military operation.
This ruling of torturing testified and accepted by Islamic researcher as particular affirmative proposition in certain case against war criminal, which modern time Islamic jurisprudence law theorists agreed on by viewing the measure as the necessity of law upholding, rather than degradation of the rights of the prisoner as human.

Internal conflict: Internal conflicts include "civil wars", launched against rebels, and "wars for welfare" launched against bandits.
During their first civil war, Muslims fought at the Battle of Bassorah. In this engagement, Ali (the caliph), set the precedent for war against other Muslims, which most later Muslims have accepted. According to Ali's rules, wounded or captured enemies should not be killed, those throwing away their arms should not be fought, and those fleeing from the battleground should not be pursued. Only captured weapons and animals (horses and camels which have been used in the war) are to be considered war booty. No war prisoners, women or children are to be enslaved and the property of the slain enemies are to go to their legal Muslim heirs.
Different views regarding armed rebellion have prevailed in the Muslim world at different times. During the first three centuries of Muslim history, jurists held that a political rebel may not be executed nor his/her property confiscated.
Classical jurists, however, laid down severe penalties for rebels who use "stealth attacks" and "spread terror". In this category, Muslim jurists included abductions, poisoning of water wells, arson, attacks against wayfarers and travellers, assaults under the cover of night and rape. The punishment for such crimes were severe, including death, regardless of the political convictions and religion of the perpetrator.
Some modern commentators have argued that the classical precedent of harsh punishments for rebels engaging in attacks that harmed civilian populations can be taken as evidence that the religious justifications used by Islamist groups such as al Qaeda and ISIL are in fact, not grounded in the Islamic tradition.

See also: Islam and war
Geneva Conventions
Hague conventions
Rule of Law in Armed Conflicts Project (RULAC)
Itmaam-i-hujjat
Laws of war
Opinion of Islamic scholars on Jihad
Islamic Military Counter Terrorism Coalition

Notes: 

References: Aboul-Enein, H. Yousuf; Zuhur, Sherifa, "Islamic Rulings on Warfare", Strategic Studies Institute, US Army War College, Diane Publishing Co., Darby PA, ISBN 1-4289-1039-5
Abu-Nimer, Mohammed (2000–2001). "A Framework for Nonviolence and Peacebuilding in Islam". Journal of Law and Religion 15 (1/2). Retrieved on 2007-08-05.
Ali, Abdullah Yusuf (1991). The Holy Quran. Medina: King Fahd Holy Qur-an Printing Complex.
Charles, Robert H. (2007) [1916]. The Chronicle of John, Bishop of Nikiu: Translated from Zotenberg's Ethiopic Text. Merchantville, NJ: Evolution Publishing. ISBN 9781889758879.
Dāmād, Sayyid Mustafa Muhaqqiq et al. (2003). Islamic views on Human Rights. Tehran: Center for Cultural-International Studies.
Crone, Patricia (2004). God's Rule: Government and Islam. New York: Columbia University Press.
Javed Ahmad Ghamidi, Mizan (2001). The Islamic Law of Jihad, Dar ul-Ishraq. OCLC 52901690
Nicola Melis, Trattato sulla guerra. Il Kitāb al-ğihād di Molla Hüsrev, Aipsa, Cagliari 2002.
Madelung, Wilferd (1997). The Succession to Muhammad: A Study of the Early Caliphate. Cambridge University Press. ISBN 0-521-64696-0.
Maududi, Sayyid Abul Ala (1967). The Meaning of the Quran. Lahore: Islamic publications.
Maududi, Sayyid Abul Ala (1998). Human Rights in Islam. Islamabad: Da'wah Academy.
M. Mukarram Ahmed, Muzaffar Husain Syed, ed. (2005). "Encyclopaedia of Islam: Introduction to Islam". Encyclopaedia of Islam. Anmol Publications PVT. LTD. ISBN 81-261-2339-7.

Further reading: Khadduri, Majid (1955). War and Peace in the Law of Islam. Johns Hopkins Press. ISBN 1-58477-695-1.
Hashmi, Sohail H., ed. (2002). Islamic Political Ethics: Civil Society, Pluralism, and Conflict. Princeton University Press. ISBN 0-691-11310-6.
Malik, S. K. (1986). The Quranic Concept of War (PDF). Himalayan Books. ISBN 81-7002-020-4.

External links: 
Jihad and the Islamic Law of War - RISSC