Double Jeopardy (one crime, multiple victims in different states)

In many countries, courts are competent to try crimes that involve one of their citizens (as the victim or as the perpetrator), regardless of where the crime has been committed.
Actually, I believe it’s the case in Mexico, so possibly also in other former Spanish colonies. So, you might be prosecuted in Guatemala for a crime committed in Mexico, if you or the victim is a citizen of Guatemala.
It would apply to Bush too. He could be prosecuted in a foreign country, not because he broke some principle of the international law or another, but just because his actions caused harm to a citizen of said foreign country. That’s what almost happened to Pinochet, when Spain requested his extradition from the UK.
And of course, the immunity a former head of State may benefit from in his own country is irrelevant in a foreign country (a current foreign head of state would benefit from diplomatic immunity, hence couldn’t be prosecuted).

I understand that, but it really doesn’t answer my question.

I don’t know.

But I wasn’t using the phrase as a term of art, but just as a general shorthand for “soldiers killed by events in a combat zone.”

When they finally caught the D.C. snipers, there was a long list of prosecutors that could have brought charges against them.

The Indian Penal Code applies to extra-territorial crimes committed by Nationals:

http://punjabrevenue.nic.in/crime1.htm#ch1

This is called the Nationality principle of jurisdiction. http://www.straightdope.com/mailbag/mlawofsea.html