N.H. Rev. Stat. Ann. § 113:3

Any decree entered pursuant to the provisions of RSA 113:2 shall remain in force until revoked by the court upon cause shown and no act done by any substituted fiduciarypro tem or co-fiduciary or co-fiduciaries while such decree is in force shall be impeached on the ground that a fiduciary was not in or had ceased to be in military service.