The harbour of St. John 's was defended Defending by a number of fortifications and gun emplacements such as Fort Amherst , Chain Rock Battery , Fort Frederick , and the large star-fort known as Fort Townshend .

It formed Cause_to_amalgamate part of the German defensive Defending system in the Somme sector of the Western Front during the First World War and consisting Cause_to_be_included of a mass of machine-gun emplacements , trenches and dug-outs .