[header] How to defend yourself against a trespasser who sues for injuries [title] Analyze the lawsuit. [step] When you are sued, the first document you will receive regarding the case will probably be the plaintiff's complaint. The complaint is a legal document that tells you why you are being sued and why the plaintiff thinks you violated the law. 
It is submitted to the court and you receive a copy for yourself. In addition to the complaint, you will also receive a summons, which is a form detailing how you must respond and when you must respond.