The first four day of last week—Sunday, Monday, Tuesday and Wednesday—were distinguished for the splendid operation and achievements of the Grand Army under General McClellan on the York peninsula.

On Sunday, by a triumph of consummate strategy and engineering skill, McClellan took possession of Yorktown, which the rebel Generals had been compIled to evacuate and retreat ten mile up the peninsula to their works at Williamsburg, where they doubtless calculated upon making good their position.