President Trump's first-quarter salary donation of $78,333 will go toward preserving the Civil War battlefield at Antietam, Interior Secretary Ryan Zinke announced Wednesday.

"As both the secretary of the interior and a military veteran, I'm deeply honored and humbled to deliver the donation to Antietam National Battlefield on behalf of President Trump," Zinke said. "Visiting the hallowed ground the day after Independence Day is incredibly moving and it underscores the importance of why we must preserve these historic grounds.

"The president's donation will allow generations of Americans to learn about our history and heritage on this sacred site."

Zinke announced how the money will be spent while touring the Western Maryland battlefield. He also announced that an additional $7.2 million in grants would be made to "identify, preserve and protect" historic battlefield sites.

Zinke was joined by representatives from Antietam, the Civil War Trust, the National Park Foundation and the Save Historic Antietam Foundation in making the announcement.

President Trump donated the first quarter of his presidential salary in early April, totalling $78,333. The Interior Department said that after Trump donated his salary to the National Park Service, anonymous donors sent money for the agency to use in preserving the nation's historic parks, which are suffering from a $12 billion maintenance backlog.

The Interior Department said an "anonymous donor pledged $22,000 to bring the president's $78,333 donation to an even $100,000."

"The Civil War Trust and the National Park Foundation, and Save Historic Antietam Foundation have also pledged funds bringing the total gift to $263,545."

The money will go toward restoring the historic Newcomer House on the Antietam battlefield, while providing underwriting to replace 5,000 feet of rail fencing that has deteriorated along the Hagerstown Turnpike "where some of the most intense fighting of the battle occurred," the agency said.

The $7.2 million in grants for historic battlefields will go toward preserving about 1,200 acres as part of the pre-existing American Battlefield Land Acquisition Grants program.

The Interior Department said the grants will be used for 19 battlefields "threatened with damage or destruction by urban and suburban development in Arkansas, Maryland, Mississippi, New York, Pennsylvania, South Carolina, Tennessee, Virginia and West Virginia."

Zinke said the lands "were once the scenes of our nation's bloodiest conflicts" that "we must preserve ... for future generations of Americans to remember and understand the impact of sacrifices of those who fought on these hallowed grounds. This grant program, along with President Trump's donation will help ensure just that."

The Battle of Antietam was fought near Sharpsburg, Md., on Sept. 17, 1862. The battle halted the Confederacy's first advance into the North and was the bloodiest single-day battle of the war, with 23,000 soldiers killed.