Editing Roman siege engines (section)

===Mine===

[[Mining (military)|Mines]] could be dug under city walls as a means of entering a city secretly and capturing it but were more frequently constructed to weaken city walls.  Once dug, [[sappers]] would underpin the walls with wood and cause the walls to collapse by firing the supports with resin, sulfur and other incendiary materials.<ref>Gilliver 1999: 140</ref>