N.H. Rev. Stat. Ann. § 565:13

During the pendency of such suit the court, on motion, may order the name of any person interested to be indorsed on the original writ in manner aforesaid, and he shall thereupon be entitled to the same rights as if his name had been so indorsed before the service of the writ but subsequent to the other indorsers, upon his giving bond, with sureties, for the payment of costs.