
The Arkansas Post was the first European settlement in the lower Mississippi River Valley and present-day Arkansas when Henri de Tonti established it in 1686 as a French trading post on the banks of the lower Arkansas River. The French and Spanish traded with the Quapaw for years, and the post was of strategic value to the French, Spanish, and Americans. It was designated as the first capital of the Arkansas Territory in 1819, but lost that status to Little Rock in 1821. During the years of fur trading, Arkansas Post was protected by a series of forts. The forts and associated settlements were located at three known sites and possibly a fourth, as the waterfront area was prone to erosion and flooding.

Camp Ford was a POW camp near Tyler, Texas, during the American Civil War. It was the largest Confederate-run prison west of the Mississippi.

Chimborazo Hospital was an American Civil War era facility built in Richmond, Virginia to service the medical needs of the Confederate Army. It functioned between 1862 and 1865 in what is now Chimborazo Park, treating over 76,000 injured Confederate soldiers. During its existence, the hospital admitted nearly 78,000 patients and between 6,500 and 8,000 of these patients died. This mortality rate of between 8.3 and 10.3 percent is among the lowest such rates of period military hospitals.

Fort Donelson was a fortress built by the Confederacy during the American Civil War to control the Cumberland River leading to the heart of Tennessee, and the heart of the Confederacy. The fort was named after Confederate general Daniel S. Donelson.
Fort Gaines is an historic fort on Dauphin Island, Alabama, United States. It was named for Edmund Pendleton Gaines. Established in 1821, it is best known for its role in the Battle of Mobile Bay during the American Civil War.
Fort Johnston was a British fort, later a United States Army post, in Brunswick County, North Carolina on Moore Street near Southport, North Carolina. It stands on the west bank of the Cape Fear River, four miles above its mouth.

Fort McAllister was a Confederate earthen-work fort used to defend Savannah, Georgia during the American Civil War. It was the southernmost of the forts defending Savannah and was involved in the most battles. It was located on the Ogeechee River in Bryan County. It is listed on the National Register of Historic Places (#70000197). Fort McAllister was one of three forts protecting Savannah, the others being Fort Pulaski and Fort James Jackson standing in Confederate defiance of the Union naval blockade. The southeast coast of the United States was the place where both combatants tested the latest in naval artillery and coastal defenses. Fort McAllister was the key to unlocking the defenses around Savannah, one of the most important Confederate ports on the Atlantic Ocean.
Fort Morgan is a historic masonry pentagonal bastion fort at the mouth of Mobile Bay, Alabama, United States. Named for Revolutionary War hero Daniel Morgan, it was built on the site of the earlier Fort Bowyer, an earthen and stockade type fortification involved in the final land battles of the War of 1812. Construction was completed in 1834 and it received its first garrison in March of the same year.
Fort Moultrie is a series of fortifications on Sullivan's Island, South Carolina, built to protect the city of Charleston, South Carolina. The first fort, formerly named Fort Sullivan, built of palmetto logs, inspired the flag and nickname of South Carolina, as "The Palmetto State". The fort was renamed for the U.S. patriot commander in the Battle of Sullivan's Island, General William Moultrie. During British occupation, in 1780–1782, the fort was known as Fort Arbuthnot.

Fort Smith National Historic Site is a National Historic Site located in Fort Smith, Arkansas, along the Arkansas River. The first fort at this site was established by the United States in 1817, before this area was established as part of Indian Territory. It was later replaced and the second fort was operated by the US until 1871. This site was designated as a National Historic Landmark in 1961.

Fort Sumter is a sea fort in Charleston, South Carolina, notable for two battles, the first of which began the American Civil War. It was one of a number of special forts planned after the War of 1812, combining high walls and heavy masonry, and classified as Third System, as a grade of structural integrity. Work started in 1829, but was incomplete by 1861, when the Civil war has begun.

The Tower Building of the Little Rock Arsenal, also known as the Main Building of the U.S. Arsenal at Little Rock, or Headquarters Building of the Little Rock Barracks, is the home of the MacArthur Museum of Arkansas Military History. It is also a part of the MacArthur Park Historic District, in Little Rock, Arkansas.