A strongpoint is a key point in a defensive fighting position which the rest of the positions rely on.[1] Its primary requirement is that it should not be easy to defeat by the enemy.[2] In general, high ground is preferred. But any good tactically important terrain can be used as a strongpoint.[3] Examples from history include Battle of Thermopylae, where 300 Spartans held off an entire Persian army at a narrow pass in the mountains.[4] In the Battle of Monte Cassino in Italy in World War II, the area around the abbey of Monte Cassino was used by the German army as a strongpoint until it was destroyed by American bombers.[5]