Abstract: A target for night-time gunnery and similar practice with the use of a heat responsive sight comprises a thin, supple fabric supported on a rigid frame to be substantially flat, with a front surface facing towards a location from which firing takes place. The fabric comprises a front protective sheet, preferably plastic, which is transparent to infra-red radiation, and a rear radiation-absorbing sheet of low heat capacity, preferably foil. A coarse-mesh net, between said sheets and secured to both, holds them spaced and parallel to cooperate in defining a heat insulating air space between them. An infra-red radiator heats the heat-absorbing sheet, which preferably has a radiation absorbing matte coating on its rear surface and a colored front surface coating. When warmer than its surroundings, the heat absorbing sheet thus radiates as a black body.