N.H. Rev. Stat. Ann. § 636:1
I. A person commits the offense of robbery if, in the course of committing a theft, he:
III. Robbery is a class B felony, except that if the defendant:
(c) Inflicted or attempted to inflict death or serious injury on the person of another,
the offense is a class A felony, except that if the defendant was actually armed with a deadly weapon, and the deadly weapon was a firearm, he shall be sentenced in accordance with RSA 651:2, II-g.
Source. 1971, 518:1. 1990, 95:5, eff. June 12, 1990.