How many troops did Petersburg have?

Answer 1

When, on June 14, 1864 Grant succeeded in deploying undetected the bulk of the Army of the Potomac south of the River James, cheating Lee who deployed his army north of that river, Petersburg and its fortifications called Dimmock line, were virtually undefended. The only Confederate units manning the lines were: the infantry brigade Wise, the cavalry brigade Dearing and a handful of militia men for a total of about 3,500 men, who, in the evening of 15th were reinforced by the infantry division Hoke (6,753 men) and the division Bushrod Johnson (6,300 men) for a total of about 16,000 men.

In the same evening of 15th the Federals had already deployed about 40,000 men, ready to invest Petersburg.