Here is some good information on the types of guns and artillery that were used.
hope this helps,
Dear Ms. Hulkower,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Endorsements Sent, 1/1880 - 5/1881 in the Records of U.S. Army Continental Commands (Record Group 393) that contains information regarding endorsements along with a summary of the incoming communication of Fort Wadsworth, New York. We also located the series Inspection Reports of Offices and Fortifications, 1867 - 1867 in Record Group 393 that contains inspection reports of the post. Next, we located the series Letters Received, 1/1867 - 12/1867 in Record Group 393 that contains incoming communications of post boards of officers. For more information about these series, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
Lastly, we located Battery Emplacement Books, 1901 - 1940 in the Records of U.S. Army Coast Artillery Districts and Defenses (Record Group 392) that may include the information you seek. For information about this series, please contact the National Archives at New York (RE-NY) via email at email@example.com.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1 and RE-NY. We apologize for this inconvenience and appreciate your understanding and patience.
For a history of the fort, please see the National Park Service: Detailed History of Fort Wadsworth
We hope this is helpful. Best of luck with your research!