Where did lee sought to break the union siege of Petersburg in march 1865?

Lee attempted to break the Siege of Petersburg on March 25,1865 attacking by surprise Fort Stedman a Union fortification dominating a Confederate salient that stood inside the Federal lines. A successful outcome of the assault would have led to a thorough breakthrough and forced Grant to evacuate the whole front from Fort Stedman up to the Boydton Plank Road, in order to cover the line of communication with his base of City Point a vital strategic point for the besieging army. But it was not to be. Fort Stedman was conquered but after a bitter combat the attack was repulsed and the Confederates lost about 5,000 dead, wounded, prisoners and missing. The Union losses were 2,000 dead, wounded prisoners and missing. After the battle Lee let warned Jefferson Davis that the evacuation of Petersburg and Richmond was becoming inevitable.