34. The English now retreated to Fort George. Soon afterward three thousand men, under Colonel Bradstreet, were sent against Fort Frontenac, on Lake Ontario, which, after a siege of two days, was compelled to capitulate. The fortress was demolished. Bradstreet's success more than counterbalanced the failure of the English at Ticonderoga. [Sidenote: =Destruction of Ft. Du Quesne.=] 35. Late in the summer General Forbes, with nine thousand men, advanced against Fort Du Quesne. Washington led the Virginia provincials. On the 24th of November he was within ten miles of Du Quesne. During that night the garrison took the alarm, burned the fortress, and floated down the Ohio. On the 25th the victorious army marched in, raised the English flag, and named the place PITTSBURGH. 36. General Amherst was now promoted to the chief command of the American forces. By the beginning of summer, 1759, the British and colonial armies numbered nearly fifty thousand men. The entire French army scarcely exceeded seven thousand. Three campaigns were planned for the year: General Prideaux was to conduct an expedition against Niagara. Amherst was to lead the main division against Ticonderoga and Crown Point. General Wolfe was to proceed up the St. Lawrence and capture Quebec. 37. On the 10th of July, Niagara was invested by Prideaux. Two weeks later the fort capitulated, and the French, to the number of six hundred, became prisoners of war. At the same time Amherst was marching with an army of eleven thousand men against Ticonderoga. On the 22d of July the English forces landed, and on the 26th the garrison retreated to Crown Point. Five days afterwards they deserted this place also, and withdrew to Isle-aux-Noix, in the river Sorel. [Illustration: MAP SHOWING THE COLONIES. at the time of FRENCH AND INDIAN WAR.] 38. Early in the spring General Wolfe began the ascent of the St. Lawrence. His force consisted of nearly eight thousand men, and a fleet of forty-four vessels. On the 29th of June General Monckton was sent to seize Point Levi. 39. On the 9th of July, General Wolfe crossed the north channel, and encamped on the east bank of the Montmorenci. This stream was fordable at low water. On the 31st of the month a severe battle was fought at the fords of the river, and the English were repulsed with heavy losses. [Sidenote: =The Plains of Abraham.=] 40. Exposure and fatigue threw the English general into a fever. It was decided to ascend the St. Lawrence, and gain the Plains of Abraham, in the rear of the city. The lower camp was broken up, and on the 6th of September the troops were conveyed to Point Levi. Wolfe then transferred his army to a point several miles up the river. [Illustration: QUEBEC IN 1759.]