What misguided strategy caused lord willam howe and the british to fail?

Fighting a traditional war rather than trying to win the civilian support.

Explanation:

William Howe launched a series of campaigns against the American rebels, conquering the cities of New York, New Jersey and Philadelphia. However, his poor planning in the campaigns carried out in 1777 contributed to the failure of General John Burgoyne at the Battle of Saratoga, which was a turning point in the war on behalf of the rebels

Many contemporary historians and scholars discuss how Howe's actions in 1777 actually contributed to British defeat in the war, but the most commonly accepted motive is that he fought a traditional war instead of seeking civilian support.

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