Note 97 — VII THE INVESTMENT OF BOSTON

Estimated number of shots required at night from ships afloat at 6,000 yards: to destroy position-finding tower which is visible, 22 12-inch shells, 250 4-inch shells or 2,500 3-inch shells; to destroy invisible station without tower, 400 12-inch shells, 5,000 4-inch shells; to destroy search-light, 24 12-inch shells, 300 4-inch shells or 3,000 3-inch shells. This fact makes it feasible to protect outlying and secondary range stations perfectly if sufficient troops can guard each station to fight off landing parties. An enemy will surely land men to destroy them unless he knows they are well defended.