 The mortars were taken from Battery Piper at Fort Hamilton in Brooklyn, and the six-inch guns were brought in from Battery Burke at Fort Hamilton and Battery Kinney at Fort Slocum on Davids' Island.However, as the mortars were sited adjacent to Naval Air Station Rockaway there were concerns that when fired they could potentially cause damage to the installation.In 1919-1920 the fixed mounts were replaced with railway mortars that could be moved away from the air station for firing.