Battery on a Law Enforcement Officer

Battery on a Law Enforcement Officer - is when a person intentionally makes physical contact with a law enforcement officer that results in bodily injury or is considered to be offensive conduct. Battery is different from an assault in that an assault is merely an attempt to cause harm. An example of a battery is if a person punches another person intending to cause them bodily harm. Indirect contact such as throwing an item at a person is also a battery. In order to be found guilty of a battery, the person must have intended to make the physical contact with victim; accidental contact does not constitute a battery.

Source: http://www.legalmatch.com/law-library/article/battery-on-a-police-officer.html