Why was Grant’s attack on Vicksburg called a siege?

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Explanation:

Grant hoped to secure control of the Mississippi River for the Union. By having control of the river, Union forces would split the Confederacy in two and control an important route to move men and supplies. The last major Confederate stronghold on the Mississippi River was the city of Vicksburg, Mississippi.

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.