N.H. Rev. Stat. § 154:4
The firefighters shall be organized in such companies, under the supervision of duly selected officers, and shall be subject to such duties in relation to the care, preservation and use of the public property entrusted to them, and to meeting for drill in the management thereof, as the chief, firewards or engineers shall direct or approve; and shall, by night or day, under their direction, use their best endeavors to extinguish any fire that may happen in their town or the vicinity of their town. Firefighters may also mitigate other emergencies which may happen in their town or the vicinity of their town.
RSA 154:4
1849, 863:2. CS 117:2. GS 96:14. GL 106:14. PS 115:4. PL 146 :4. RL 175:4. RSA 154:4. 1992, 154:4. 2012, 242:4. 2013, 173:1, eff. July 2, 2013.