"A close examination of 116 skulls left over from 2000 years of warfare indicates that ancient Mayan armies used nasty spiked clubs for combat in open terrain." Source: CQ University Australia.
"The widespread adoption of these clubs, as well as projectiles, may have been due to larger armies enlisting more commoners.
"A recent published study follows previous research into Mayan skeletal trauma indicating a fondness for flaying and decapitation, heart extraction, dismemberment, de-fleshing, parry fractures and head fractures."
Notes: If you're interested in the subject of ultraviolence in Mayan culture and the way the Maya have been romanticized in the modern world, see "Collapsing the Maya," an essay by the Australian writer Roger Sandall, author of "The Culture Cult: Designer Tribalism and Other Essays," Westview Press, 2001. Posted by permission on this site.
For more information on advanced Mayan technology, see my review of the book "The Lost Secrets Of Maya Technology" by James A. O'kon.
Video below shows a collection of Mayan knives and daggers.