The armed Zapatista movement started in 1994 as an armed revolution and spanned more than 20 years.
Disambiguation - this is the 1983/1994 movement, not the 1910 movement.
It is surprising to note that there seem to be no records of them actually killing anyone, while the counter-revolutionary forces have killed several Zapatistas.
“After they took San Cristobal, the Zapatistas went into combat at the Rancho Nuevo military base, the nearest base to San Cristobal de las Casas. I was there, this photo is mine. They are dead Zapatistas killed in battle. They were also ambushed. When I took this photo, 20 or so of them died. They were uniformed, they had been killed barely 20 minutes before. We heard the bullets… It was horrible.”
Citation taken from this photo report where you can see several pictures of dead Zapatistas. You can also see photos of the guerillas with weapons and practicing.
However, Wikipedia and other articles such as the one mentioned earlier only claim killing by the army and not the Zapatistas. The Chiapas Movement Wiki does claim that one soldier was killed on 2nd February 2011 (all other killed are the Zapatistas).
A post from 2014 claims that the media is distorting facts about the conflict and that the Zapatistas have been on the receiving end.
Subcommandante Marcos claims:
"We didn't go to war to kill or be killed. We went to war in order to be heard."
But it is hard to belive that in 20 years of armed conflict the Zapatistas have not actually attacked or killed anyone (or at least more than the claim of 1 sole soldier).
What is the truth about casualties inflicted by them?