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Activist, the Portland Police warned you and your fellow activists to leave the area. If they used all the equipment you mentioned then this was not a peaceful protest or march but turned into civil disobediance which can and usually does turn into a riot situation where innocent people are hurt at random and usually by the riot instigators and not the police. I am sorry this happened to you but in some countries horses are trained to stomp on protesters. In the US they are trained to use their flanks and sides to push crowds.