Its mission was to protect the Cape Cod Canal and New Bedford from possible air and naval attack.

[1] The reservation had a battery of two 6-inch M1 guns on long-range shielded carriages, with a large magazine and fire control bunker between them.

An Anti-Motor Torpedo Boat (AMTB) battery of four 37 mm towed guns was also on site.

The Navy turned the site over to the Air Force in 1958, who operated it as the Mishaum Point Electronics Research Annex until sold to a private party in 1964.

[2] Demolition of the Harbor Entrance Control Post was completed in about 1970 when the first mansion was built atop Battery 210.