Abstract: A new single-use personal defense device for warding off, and marking, potential and actual attackers. The inventive device includes a housing containing a sealed container therein which contains a supply of pressurized attack-repellent chemical. The container includes a frangible surface which is pierced by a sharp piercing end of a hollow tube when the tube is actuated by a trigger. The chemical then flows through the hollow tube to a dispensing end where the chemical is discharged to the exterior of the housing. The chemical is an indelible dye and/or an odoriferous scent material, so that when sprayed onto an attacker, the attacker is marked by the chemical so that the attacker can be easily identified.