What military strategy did Washington and his Army use at this location as they surrounded the British by land and sea and later used massive cannon bombardment force their surrender?

Hi myself Shrushtee.

Explanation:

The Siege of Yorktown, also known as the Battle of Yorktown, the surrender at Yorktown, or the German Battle, ending on October 19, 1781, at Yorktown, Virginia, was a decisive victory by a combined force of American Continental Army troops led by General George Washington and French Army troops led by the Comte de Rochambeau over a British army commanded by British peer and Lieutenant General Charles Cornwallis. The culmination of the Yorktown campaign, the siege proved to be the last major land battle of the American Revolutionary War in the North American region, as the surrender by Cornwallis, and the capture of both him and his army, prompted the British government to negotiate an end to the conflict. The battle boosted faltering American morale and revived French enthusiasm for the war, as well as undermining popular support for the conflict in Great Britain.[10]

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What the person above me said is true. The French were in Chesapeake Bay in their ships and the Americans on land in Yorktown. They knew this plan would work cause they had a spy named Hercules Mulligan who spied on the British government. After a week of fighting, one of the British stands on a parapet and waves a white handkerchief. Washington negotiates the terms of surrender. They then escort the British out of Yorktown.

If you watch the musical Hamilton, it'll be a fun way to learn about the American Revolution. The musical and the animatic is available on  you tube, and the actual acting and on-stage singing is on Disney+.

Hope this helps! Good luck!