Current-algebra techniques and the hypothesis of partially conserved axial-vector current are used to derive a low-energy theorem for the reaction $e+N\ensuremath{\rightarrow}e+N+\ensuremath{\pi}+\ensuremath{\pi}$ (soft). Particular attention is paid to satisfying the requirements of gauge covariance. Except for recoil corrections, the resulting matrix element is proportional to the nucleon axial-vector form factors, and we suggest that this electromagnetic process may be used to measure ${g}_{A}({k}^{2})$.