Southgate Fort

Southgate Fort was a fortified location built around Boston's southern entrance, on top of the Boston Neck. During the French and Indian War it was partly run by Silas Thatcher and his part of the British Army, including a general, used as a location for holding Native slaves.

At one point, the fort was infiltrated by the Templar Haytham Kenway and his co-conspirators to free the slaves and kill Silas.

History
In beginning of the 18th century, the only land-route to Boston was across the Boston Neck. In order to have protection from possibly land attacks, fortifications were built around the area, which was known at the time as the Southgate Fort. By 1754, Silas was the man in charge of the fortifications, which he used to house slaves he was gathering from native lands. One of the tribes that had people taken as slaves was the Kanienkeha:ke, which were also being searched for by the Templars.

When the Templars discovered that some of the slaves were from the tribe they sought, Haytham created a plan to infiltrate the area. After raiding a convoy, they went in as a Trojan Horse to 'deliver' the slaves. After Haytham killed the fort's general and freed the slaves of the area, he continued to kill Silas with the help of his co-conspirator, Benjamin Church.

During the Siege of Boston in 1775, the Governor of Massachusetts had the fortifications of Southgate strengthened and expanded to protect the city. It was then known by most as Gage's Lines.

In the 19th century, land was added to the Boston Neck so that there was more room for the city to grow and to ease the traffic of the area. By this point, the fortifications weren't increased, since there was no longer a threat of attack from the countryside.

Trivia

 * Southgate Fort is Assassin's Creed III's tutorial fort.
 * During the infiltration, the Templar Conspirators are displayed with the Assassin Insignia over their heads, despite being the opposition to the brotherhood.