What important base southwest of Louisbourg did British captured?

The important base southwest of Louisbourg that the British captured was the French fortification known as Fort Louisbourg itself. The British seized Louisbourg in 1745 during King George's War, which was a significant event as it provided the British with control over a key strategic location for naval operations and trade in the North Atlantic. This capture was pivotal in weakening French influence in the region and bolstered British power in North America.