--It having been definitely ascertained several days since that the enemy was mining in front of an important position on our centre, countermining was at once begun, and pushed forward for the purpose of preventing the consummation of his object.
The enemy's sap was approached some distance in front of his breastworks, and beneath his picket line, where chambers were dug and powder deposited.
All being in readiness, and while the enemy's diggers were still excavating beneath and his skirmishers firing above, the mine was sprung, causing a heavy explosion and throwing the earth upwards some height.
The enemy was much confused by his unexpected event, but soon manned their cannon and sprung to their breastworks.
No infantry attack was made on our side, none having been intended.
The object of the mine was fully gained in destroying the enemy's sap, which it is believed, was done effectually, with some loss to the Yankees
Immediately after the explosion the enemy opened a fierce cannonading on our lines, which was replied to by our artillery.
Everything very quiet yesterday and to-day.