C. They laid siege to the city for many days is the correct answer.
Explanation:
The victory of the Vicksburg was one of the greatest victory of the Union as the Union got control of the Mississippi river. At the same time General Robert E. Lee was also defeated at the Battle of Gettysburg.
General Grants army reached Vicksburg on May 18, 1863 and faced General Pemberton. Pemberton and his soldiers were hiding behind the defences of the city. At first Grant tried to break in the city but it didn't work so he decided to besiege the city and starve the confederate soldiers. General Pemberton was finally defeated and the soldiers surrendered on July 4, 1863
Once Grant arrived at his destination, he found the city too strong to assault, so he had his men build trenches and laid siege to the city.
The siege began in May of 1863 and lasted until July 4. With no hope of reinforcements, and his men starving, Confederate General John Pemberton finally surrendered the city.
