Abstract: This invention relates to decoy devices and in particular decoy devices which deceptively simulate target objects such as artillery pieces, armoured vehicles or aircraft. According to the invention there is proposed a decoy device comprising a two dimensional simulation of a target object appearing upon a flexible sheet to the reverse side of which there is fitted a support system of parallel poles, such poles arranged in parallel being affixed to the sheet so that together with the target sheet bearing the simulation, they can be rolled up for transportation.