N.H. Rev. Stat. Ann. § 273-A:13

Strikes and other forms of job action by public employees are hereby declared to be unlawful. A public employer shall be entitled to petition the superior court for a temporary restraining order, pending a final order of the board under RSA 273-A:6 for a strike or other form of job action in violation of the provisions of this chapter, and may be awarded costs and reasonable legal fees at the discretion of the court.