Simplify the following text for a Grade 6 native English-speaking person.
Original: The battlefield was left with the bodies of more than 7,500 soldiers and 5,000 horses of the Army of the Potomac and the Confederacy 's Army of Northern Virginia , and the stench of rotting bodies in the humid July air was overpowering .
Simplified: The battlefield had more than 7,500 bodies of dead soldiers and 5,000 horses .