In 1662, the French established a strategic trading post in a well protected cove overlooking Placentia Bay that separates Avalon from the rest of the island of Newfoundland, located close to Grand Banks.

Fort Plaisance was built inside the harbor in order to protect the small port city of Plaisance from an attack enemy.

During its construction, the Fort Plaisance had earthen ramparts reinforced by wooden stakes.

In 1713, the Treaty of Utrecht forced the French to abandon their settlements in Newfoundland.

The French inhabitants were moved to Île Royale which began the construction of Louisbourg.