N.H. Rev. Stat. § 109:13
Whenever a fire emergency shall have been proclaimed by the governor, as provided in this chapter, in order to permit fire-fighting personnel and equipment within the state to be utilized to maximum advantage on a coordinated basis, no municipal fire-fighting force or fire-fighting equipment shall, under the authority herein granted, cross the boundary of the municipality to which it pertains without immediately reporting the fact, through the chief executive officer of such municipality to the state fire marshal in such manner and extent as he or she shall prescribe, keeping the fire marshal currently informed relative to the process being made and, upon completion of its duties in such other municipality, giving immediate notice of the return of the personnel and equipment to their normal station. Under the emergency conditions contemplated by this section, no such fire-fighting personnel or equipment shall go more than 20 miles beyond the boundary of the state, or more than 20 miles beyond the boundary of the municipality to which such fire-fighting force or equipment pertains without prior permission of the state fire marshal, acting upon the authority of the governor. In such instances, progress and final reports shall be made to the state fire marshal in such manner and by such means as he or she may prescribe.
RSA 109:13
1949, 257:1, par. 18. 2011, 169:4, eff. Jan. 1, 2012.