General Wolfe, appointed commander of the expedition against Quebec, comes to bid his mother goodbye. Before sailing, the general calls upon his sweetheart, Katherine Lowther. She presents him with a locket containing a miniature of herself. Wolfe places the jewel on a chain about his neck. Mignon Mars and her brother, Hubert, of a Canadian family, are captured by a body of men attached to the Royal Americans. Lieutenant Arleigh, the officer in charge, secures their release. Mignon loses her heart to the young officer. General Montcalm arrives at Quebec and takes command of the French forces. Under his supervision, fortifications are erected on the isle of Orleans, to protect the approach to the city. The general gains the enmity of Vaudreuil, the vainglorious governor, when he protects Mignon Mars from the unwelcome attentions of the latter. Mignon's brother enlists in the French army and is made an officer. The English fleet carrying Wolfe's men arrives off the Isle of Orleans. Wolfe entices the Canadian pilots aboard his vessel by raising the French flag. The pilots are compelled to take the fleet up the river, under penalty of death. Mignon discovers Wolfe's ruse and rides to warn Montcalm of the approach of the English fleet. Wolfe lands his soldiers on the Isle of Orleans, twelve miles below Quebec. The fleet then proceeds up the river and anchors before Quebec. In an effort to destroy the fleet, Montcalm prepares to fire the ships. But the wind and the tide are against the French, and the fire ships drift ashore. Under orders from the young commander-in-chief, Monckton, one of the British generals, seizes Point Levis, overlooking Quebec. Wolfe offers amnesty to the Canadians who lay down arms. The inhabitants, however, prove unruly. Later, the English batter away at Quebec, with the fortifications at Point Levis and the guns of the fleet. The bombardment does terrific destruction, houses being rattled by the shot and shell, while fires, caused by the rain of death, spring up everywhere. Bushwackers attack the Chateau Mars, on the Isle of Orleans, the home of Mignon. The girl and her father are in dire peril, when Wolfe and his men approach and drive the renegades before them. Wolfe makes the chateau his headquarters. Wolfe orders an attack on the French redoubts above Montmorenci Falls. The impetuosity of the Grenadiers leads them to disobey orders, with the result that the English are compelled to retreat, after a desperate battle. The approach of the Highlanders, who cover the retreat of the army, saves the English from annihilation. Lieutenant Arleigh strives in vain to check the retreat. Fighting like a hero, he is shot by an Indian, a Caughnawaga ally of the French. The redskin is about to scalp the young soldier when Hubert Mars comes to the rescue. The Canadian saves Arleigh's life, but is himself desperately wounded. Wolfe is greatly downcast by the defeat. He returns to the chateau in dejection. Mignon looks in vain for her English lover. She learns that he is among the missing. Setting forth, she searches the battlefield among the dead and wounded. Mignon hears that Hubert is wounded and goes to the hospital to see him. To her delight, she sees Arleigh lying on the cot next to her brother. Mignon returns to the chateau and reports to Wolfe that his young aide is captured. That night, Arleigh makes his escape by changing cots with a French soldier who has died. He dons the man's uniform and leaves the hospital. Later, Arleigh succeeds in escaping through the French lines. He swims out to the English fleet. The following day, Mignon returns to the hospital and is informed that Arleigh is dead and has just been buried. Heartbroken, she returns home with the sad news. Wolfe is stricken with a fatal illness and learns that he cannot recover. During his sickness, his brigadiers recommend an attack without his knowledge. Wolfe learns of it. Despite his weakness, the commander-in-chief rises from his bed and goes to take command. In his escape, Arleigh has learned of Montcalm's intention to send boats and supplies down the river at nightfall. He returns to the chateau and delivers his information to Wolfe. Mignon is overjoyed to find her sweetheart safe. Wolfe learns of a narrow path leading up the mountain side to the Plains of Abraham. The English troops are sent down the river and due to the password given by Arleigh are enabled to slip by the French sentries. All night long the English toil up the mountainside. When morning dawns, they are drawn up in battle array on the Plains of Abraham. The fight commences. Montcalm, emerging from his tent, grows uneasy when he hears the sound of firing. He learns of the state of affairs. The bugles summon the French troops to battle and they march forth to the Plains of Abraham. Montcalm calls upon Vaudreuil, the governor, for assistance, but that cowardly official refuses to render aid. The French approach within firing distance of their foe. Wolfe delivers a stirring address to his men as the French approach. The battle commences. The opposing forces come together with a clash that sends both sides reeling. Forward they spring, slashing and stabbing like madmen. Wolfe is in the thickest of the fray. A shot strikes him. He falls. A tremendous shouting arrests his agony. "They run, they run," cries one of his aides. "Who runs?" gasps Wolfe. "The enemy." "Now God be praised," the dying man whispers, "I die happy." At the same moment, Montcalm, desperately striving to check the rout, is mortally wounded. The French commander is carried to his headquarters. He is informed that his wound is mortal. "How long shall I live? Twelve hours more or less? So much the better. I am happy that I shall not live to see the surrender of Quebec," he gasps. Wolfe's body is placed aboard the English flagship to commence its journey to the land for which he gave his life. Seated in a boat on the river, Arleigh and his bride, Mignon, watch the vessel sailing out towards the setting sun.