What did the Union Army do to the city of Vicksburg during the Battle of Vicksburg?

Approached it with extreme difficulty from the West bank of the Mississippi.

Managed to cross the river downstream unobserved, by distracting the garrison commander, Pemberton, with a cavalry raid.

Fought Pemberton in the open country to the East, and drove him back into his lines.

Besieged the town and attacked its fortifications - often shouting a warning to Johnny Reb to get his head down!

Starved it out, and took the surrender on the Fourth of July, paroling 30,000 prisoners, to the immense gratitude of the town, which actually held a memorial service for Grant when he died - unheard-of in the Deep South.

It was a mighty long time before they next celebrated the Fourth of July, however!