RSA 109:4: Powers, Rights, Privileges and Immunities.

Whenever, pursuant to the authority granted under this chapter, the members of a local fire department are engaged in assisting another municipality in combatting a fire emergency in such other municipality, such local fire department personnel shall possess the same powers, and have the same duties, rights, privileges and immunities they would have if they were performing the said duties for the municipality or municipalities to whose fire department they are normally attached.