During the Siege of Savannah,

The siege of Savannah or the Second Battle of Savannah was an encounter of the American Revolutionary War (1775-1783), in 1779. The year before, the city of Savannah, Georgia, had been captured by a British expeditionary corps under Lieutenant-Colonel Archibald Campbell. The siege itself consisted of a joint Franco-American attempt to retake Savannah, from September 16 to October 18, 1779. On October 9 a major assault against the British siege works failed. During the attack, Polish nobleman Count Casimir Pulaski, leading the combined cavalry forces on the American side, was mortally wounded. With the failure of the joint attack, the siege was abandoned, and the British remained in control of Savannah until July 1782, near the end of the war.

Explanation:

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answer is b.shrapnel

they encountered severe weather for which they were poorly prepared.