Question: Which 18th-century frontier fort at the current site of Cumberland, Maryland, USA was an important military and economic center during the war, 1756-63, that pitted the colonies of British America against those of New FranceFrance?

Context articles: Fort Cumberland (Maryland)
Fort Blount
British America
French and Indian War
Juniata River
Fort Tonoloway State Park
Fort Brady
Fort Seybert
Fort Inge
Fort Chiswell Site

Fort Cumberland (built 1754) was an 18th-century frontier fort at the current site of Cumberland, Maryland, USA.
 It was an important military and economic center during the French and Indian War (1754–63) and figured significantly in the early career of George Washington.
Fort Blount was a frontier fort and federal outpost located along the Cumberland River in Jackson County, Tennessee, United States.
 Situated at the point where Avery's Trace crossed the river, the fort provided an important stopover for migrants and merchants travelling from the Knoxville area to the Nashville area in the 1790s.
 After the fort was abandoned around 1800, the community of Williamsburg developed on the site and served as county seat for the newly formed Jackson County from 1807 and 1819.
 The fort and now vanished village sites were added to the National Register of Historic Places in 1974.
English America (later British America) refers to the English territories in North America (including Bermuda), Central America, the Caribbean, and Guyana from 1607 to 1783.
 Formally, the British colonies in North America were known as "British America and the British West Indies" until 1776, when the Thirteen Colonies located along the Atlantic seaboard declared their independence and formed the United States of America.
 After that, the term British North America was used to describe the remainder of Britain's continental North American possessions.
 That term was first used informally in 1783, but it was uncommon before the Report on the Affairs of British North America (1839), called the Durham Report.
The French and Indian War (1754–63) comprised the North American theater of the worldwide Seven Years' War of 1756–63.
 It pitted the colonies of British America against those of New France.
 Both sides were supported by military units from their parent countries of Great Britain and France, as well as by American Indian allies.
 At the start of the war, the French North American colonies had a population of roughly 60,000 settlers, compared with 2 million in the British North American colonies.
 The outnumbered French particularly depended on the Indians.
 The European nations declared war on one another in 1756 following months of localized conflict, escalating the war from a regional affair into an intercontinental conflict.
The Juniata River is a tributary of the Susquehanna River, approximately 104 mi long, in central Pennsylvania in the United States.
 The river is considered scenic along much of its route, having a broad and shallow course passing through several mountain ridges and steeply-lined water gaps.
 It formed an early 18th-century frontier region in Pennsylvania and was the site of Native American attacks against white settlements during the French and Indian War.
 The watershed of the river encompasses an area of approximately 3400 sqmi , approximately one-eighth of the drainage area of the Susquehanna.
 Approximately two-thirds of the watershed is forested.
 It is the second largest tributary of the Susquehanna after the West Branch Susquehanna.
Fort Tonoloway State Park is an undeveloped Maryland state park located near present day Hancock.
 Fort Tonoloway was a frontier fort built in 1755 by Lt. Thomas Stoddert and men from the Maryland State Militia.
 The fort was also known as Stoddert's Fort.
 It was abandoned in 1756 when Fort Frederick was constructed.
Fort Brady was a frontier fort established in Sault Sainte Marie, Michigan to guard against British incursions from Canada.
 The original location of the fort, known as Old Fort Brady, was along the Saint Mary's River.
 Fort Brady was located at this site from 1822 until 1893, when it was moved to a new location on higher ground, known as New Fort Brady.
 The fort was located at the new site from 1893 until its close in 1944.
 The site of Old Fort Brady was designated a Michigan State Historic Site in 1956 and listed on the National Register of Historic Places in 1971; New Fort Brady was designated a Michigan State Historic Site in 1970 and listed on the National Register of Historic Places in 1972.
Fort Seybert was an 18th-century frontier fort in the Allegheny Mountains in what is now Pendleton County, West Virginia, United States.
 In a 1758 surprise raid occasioned by the French and Indian War (1754–63), most of the 30 white settlers sheltering there were massacred by Shawnee and Delaware warriors and the fort was burned.
 A similar number of settlers at nearby Fort Upper Tract had met the same fate on the previous day.
 Fort Seybert, of which almost no trace remains today, was situated about 8 miles northeast of the present town of Franklin.
Fort Inge was a frontier fort in Uvalde County, Texas, United States.
 Established as Camp Leona on March 13, 1849, it was garrisoned intermittently until March 19, 1869.
 The fort served as a base for United States Army troops assigned to protect the southern overland mail route along the San Antonio-El Paso Road from Indian raids.
 The camp was renamed Fort Inge in honor of Lieutenant Zebulon M. P. Inge a West Point officer killed in the Mexican–American War.
 Other forts in the frontier fort system were Forts Griffin, Concho, Belknap, Chadbourne, Fort Stockton, Fort Davis, Fort Bliss, Fort Mason, McKavett, Clark, Fort McIntosh, Richardson and Phantom Hill in Texas, and Fort Sill in Oklahoma.
 There were "sub posts or intermediate stations" including Bothwick's Station on Salt Creek between Fort Richardson and Fort Belknap, Camp Wichita near Buffalo Springs between Fort Richardson and Red River Station, and Mountain Pass between Fort Concho and Fort Griffin.
Fort Chiswell Site is a historic archaeological site located at Fort Chiswell, Wythe County, Virginia.
 It is the site of a frontier fort built in 1758 as an outpost during the French and Indian War.
 The fort was situated at the junction of the Great Trading Path and the Richmond Road, near the New River.
 The fort fell into disrepair in the 18th century as both the county seat and courthouse were moved from Fort Chiswell to the county seat of Wytheville, 12 miles to the west.
 The remaining foundations of the Fort and its surrounding buildings were completely covered over during the construction of I-77 in Wythe County during the 1970s.
 There is a pyramid shaped historical marker of sandstone situated approximately 200 yards west-northwest of the fort's original location next to the old chicken house.