the main armament of the "active" class consisted of ten breech-loading (bl) four-inch mk vii guns. the forward pair of guns were mounted side by side on a platform on the forecastle, six were amidships, three on each broadside, and the two remaining guns were on the centreline of the quarterdeck, one ahead of the other. the guns fired their shells to a range of about . her secondary armament was four quick-firing (qf) three-pounder vickers mk i guns and two submerged 18-inch (450 mm) torpedo tubes. in 1918, two 4-inch guns were removed from "active" and "fearless". a qf three-inch 20 cwt anti-aircraft gun was added to "active" in 1916.