Washington, Sept. 9. The Star says: "Yestorday afternoon tiro cninpanies of the Third Regiment Indiana Cavalry, nnder Major J. Chapman, vvent to Poolsville, which they found in poseession of' a rebel cavalry regiment, wbo had planted, on a hilí to the right of the tovrn, one fieldpiece whiuh was openod on our men as they approached. The command did not stop but made a charge through the town. The euemy then skedaddled and formed a line of battle near the gun. In a few moments reiutorcemerits carne up - two piceos of artillery and severa] companies of the Eighth Illinois Ciivalry - and our guns ai'ter a few shots, succeeded in silencing the enemy's piece when another charge wns made by Major Chapman's aoinmand, and the rebels broke and rali, leaving seven dead on the field. Our loss is one min killed.