The energy response and the resolution of a hadron calorimeter test module prepared by the ALEPH collaboration at LEP have been studied between 5 and 50 GeV. The energy resolution for pions follows a 0.78 √E law for orthogonally incident particles. Effects of different incident polar angles ( θ = 90°, 60°, 50°) are studied. The wire readout and the trigger capability are also discussed.