Ka kammala wannan jumla: A Gaul, sansanin soja na Alesia ya kasance
a karkashin wani Roman siege a 52 BC, kuma an gaba daya kewaye da wani Roman fortification ciki har da wani katako palisade da hasumiyai. Kamar yadda aka saba da dabarun kewaye a lokacin, an sanya kananan ballistae a cikin hasumiya tare da wasu sojoji da makamai da baka ko kuma sling. An kuma nuna amfani da ballista a cikin dabarun kewaye na Roman a cikin batun kewaye da Masada.