Signal mortars were used as way of warning people about the prospect of enemy invasion.
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Styrian Armoury > Discover > Collection > Artillery and accessories > Signal mortars
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Two shots meant that enemy troops intended to invade the country. Three shots indicated that the enemy was already on its way. Four shots and a lit pile of wood meant that the enemy was already on local terrain. The warning was visible and audible from a distance, and passed on from one signal station to another.