"Assault" in Maryland defined as "intentionally causing or attempt to cause physical injury to another."
How you bring charges is to call the police. That is the only way short of suing a person. You as a civilian, DO NOT press charges, the police will do that if you can provide evidence of the assault to convince them that it happened.
Another option is a Peace Order. This is a type of restraining order you can apply for without evidence at the court house. However you must do it within 30 days of the attack. This will keep the other person away from you, and they will go to jail if they violate it.
Litigation: the processing of a civil or criminal case. A litigation attorney takes cases to court. Not all attorneys try cases in court rooms. In fact most of them don't.
Abrogation: to end something. A divorce is an example of abrogation. You want a marriage to end and the attorney makes that happen.
Subrogation: to put in place of another.
An example of subrogation is this:
I get into a car accident. The other driver has no insurance. My insurance company pays for my car's damage. I sue the person who damaged my car. I win. I collect money from the person. I can't keep that money. I have to give that money to my insurance company because my insurance company paid to fix my car. If I got more than what my insurance paid then I get to keep the excess. My insurance company subrogates my interest in this lawsuit.
Subrogation law usually deals with insurance matters. Just remember this...you can't get paid twice when it comes to insurance coverage and civil lawsuit. If your insurance company paid out money on your behalf and you recover money from the party that harmed you then your insurance company subrogates your interest.