Question: What is the current name of the fort that Phineas Stevens defended in April 1747?

Context paragraphs:
Abbé Alexandre-Auguste Robineau: Abbé Alexandre-Auguste Robineau (23 April 1747, in Paris – 13 January 1828, in Paris) was a French painter, composer, violinist, conductor, and Catholic priest.  As a composer he wrote under the name Alexandre Robineau, and as a painter he painted under the name Auguste Robineau.

Fort at Number 4: The Fort at Number 4 was the northernmost British settlement along the Connecticut River in New Hampshire until after the French and Indian War.  Now known as Charlestown, it was more than 30 mi from the nearest other British settlement at Fort Dummer.  Construction began in 1740 by brothers Stephen, Samuel and David Farnsworth.  By 1743, there were 10 families settled in a square of interconnected houses, enclosed in a stockade with a guard tower.

Phineas Stevens: Capt. Phineas Stevens (20 February 1706 – 6 April 1756) was a distinguished officer noted for his defense of the Fort at Number 4 during a siege in April 1747, when a combined force of French and Indian soldiers failed to capture the fort and the 32 British soldiers defending it.  Stevens was born in Sudbury, Massachusetts and was one of the fort's founders, serving as commander of the militia until 1750; he was also one of the earliest Anglo-American colonists to settle in the area.  Stevens was active during King George's War and the French and Indian War, and died at Halifax Harbour, Nova Scotia in 1756.

Siege of Fort at Number 4: The Siege of Fort at Number Four (7–9 April 1747) was a frontier action at present-day Charlestown, New Hampshire

Leopold I, Prince of Anhalt-Dessau: Leopold I, Prince of Anhalt-Dessau (3 July 1676 – 7 April 1747) was a German prince of the House of Ascania and ruler of the principality of Anhalt-Dessau from 1693 to 1747.  He was also a "Generalfeldmarschall" in the Prussian army.  Nicknamed "the Old Dessauer" (German: "der alte Dessauer"), he possessed good abilities as a field commander, but was mainly remembered as a talented drillmaster who modernized the Prussian infantry.

Edward Foley (1676–1747): Edward Foley (23 September 1676 – 4 April 1747) was the second son of Thomas Foley of Great Witley.  He represented the Borough Constituency of Droitwich from 1701 to 1711, when appointed Receiver of the Duties on Hides and Skins.  He again represented Droitwich from 1732 to 1741.  Foley died of an infection in his foot in 1747, leaving no children.

Johann Jacob Dillenius: Johann Jacob Dillen Dillenius (1684–2 April 1747) was a German botanist.

François Gigot de la Peyronie: François Gigot de la Peyronie (] ; 15 January 1678 – 25 April 1747) was a French surgeon who was born in Montpellier, France.  His name is associated with a condition known as Peyronie's disease.

Johann Jakob Schmauss: Johann Jakob Schmauss (10 March 1690 - 8 April 1747) was a German jurist, historian, and university professor.

Aron Elias Seligmann: Aron Elias Seligmann, "baron von Eichthal", (26 April 1747 – 11 January 1824) was a German Jewish financier.  He served as Court Jew for Charles Theodore and Maximilian I Joseph of Bavaria.  After converting to Catholicism he was ennobled in 1814 as "Freiherr von Eichthal".

Supporting paragraphs: Phineas Stevens Fort at Number 4
Answer: Charlestown