In light of the attacks on Rav Shapira and other genuine Jewish leaders, here's RaMBaM's list of the Mitzvoth on wars - courtesy of http://www.jewfaq.org/613.htm
- That those engaged in warfare shall not fear their enemies nor be panic-stricken by them during battle (Deut. 3:22, 7:21, 20:3) (negative).
- To anoint a special kohein (to speak to the soldiers) in a war (Deut. 20:2) (affirmative). See Kohein.
- In a permissive war (as distinguished from obligatory ones), to observe the procedure prescribed in the Torah (Deut. 20:10) (affirmative).
- Not to keep alive any individual of the seven Canaanite nations (Deut. 20:16) (negative).
- To exterminate the seven Canaanite nations from the land of Israel (Deut. 20:17) (affirmative).
- Not to destroy fruit trees (wantonly or in warfare) (Deut. 20:19-20) (CCN191).
- To deal with a beautiful woman taken captive in war in the manner prescribed in the Torah (Deut. 21:10-14) (affirmative).
- Not to sell a beautiful woman, (taken captive in war) (Deut. 21:14) (negative).
- Not to degrade a beautiful woman (taken captive in war) to the condition of a bondwoman (Deut. 21:14) (negative).
- Not to offer peace to the Ammonites and the Moabites before waging war on them, as should be done to other nations (Deut. 23:7) (negative).
- That anyone who is unclean shall not enter the Camp of the Levites (Deut. 23:11) (according to the Talmud, in the present day this means the Temple mount) (CCN193).
- To have a place outside the camp for sanitary purposes (Deut. 23:13) (affirmative).
- To keep that place sanitary (Deut. 23:14-15) (affirmative).
- Always to remember what Amalek did (Deut. 25:17) (CCA76).
- That the evil done to us by Amalek shall not be forgotten (Deut. 25:19) (CCN194).
- To destroy the seed of Amalek (Deut. 25:19) (CCA77).