Yes, in California, if you have been injured as a result of an assault, you may be able to file a personal injury lawsuit against the person who attack you. In order to succeed in a personal injury lawsuit, you will need to prove that the defendant had a duty to act with reasonable care towards you, breached that duty by acting in a way that was reckless or negligent, caused your injuries, and that you suffered damages as a result of the defendant's actions.