Episode 4: 1754 to 1775 CE. A period of a little more than two decades in the mid-18thcentury changes the destiny of North America. England and France battle each other in the Seven Years' War, a conflict that begins as a clash between les Canadiens and land-hungry American settlers in the Ohio Valley and becomes a world war that engulfs the continent. Fortress Louisbourg, symbol of the French empire, is the target of 27,000 soldiers and sailors in the greatest naval invasion in North America's history. In 1759, General James Wolfe leads the assault against Quebec but the citadel withstands a devastating siege and bombardment. With winter soon arriving, Wolfe forces the commander of the French troops, Louis-Joseph de Montcalm, into one last desperate encounter. The battle for North America unfolds on an abandoned farmer's field, the Plains of Abraham, just outside the city's walls. When war ends in 1763, 70,000 French colonists come under British rule, setting in motion the ever-evolving French-English dynamic in Canada.