Reports of Tularemia use in Syria and Turkey. 

Jonathan Tucker from the James Martin Center for Nonproliferation Studies in Washington, DC, US who studies the use of chemical and biological weapons, points out that there is no vaccine for tularemia and that experts consider it a "possible or likely biological warfare agent" in the present day.

Still, in order to consider the rams as a true biological weapon, evidence is needed to clearly prove that the Hittites understood the full ramifications of these animals towards their enemies, says Mark Wheelis, at the University of California, Davis.

"The intent would have to be not to just freak the enemy out, but to actually transmit disease," he explains. Until such intent to spread disease is proven beyond a doubt, Wheelis says any theory is speculative. More here

*Ok, well not really but I wouldn't put it past them.