Question: Which battle was first the Second Battle of Bull Run or Operation Grenade?
Context: The Second Battle of Bull Run or Battle of Second Manassas was fought August 28–30, 1862 in Prince William County, Virginia, as part of the American Civil War.  It was the culmination of the Northern Virginia Campaign waged by Confederate Gen. Robert E. Lee's Army of Northern Virginia against Union Maj. Gen. John Pope's Army of Virginia, and a battle of much larger scale and numbers than the First Battle of Bull Run (or "First Manassas") fought on July 21, 1861 on the same ground. Bull Run is a 32.8 mi tributary of the Occoquan River that originates from a spring in the Bull Run Mountains in Loudoun County, Virginia, and flows south to the Occoquan River.  Bull Run serves as the boundary between Loudoun County and Prince William County, and between Fairfax County and Prince William County. During World War II, Operation Grenade was the crossing of the Roer (Rur) river between Roermond and Düren by the U.S. Ninth Army, commanded by Lieutenant General William Hood Simpson, in February 1945. Bull Run is an unincorporated community in Clackamas County, Oregon, United States.  It is located about 5 miles northeast of Sandy, near the Bull Run River and the powerhouse of the defunct Mount Hood Railway and Power Company (later the Bull Run Hydroelectric Project). The North Fork Bull Run River is a tributary, about 6 mi long, of the Bull Run River in the U.S. state of Oregon.  Part of the system that provides drinking water to the city of Portland, it flows generally south through a protected part of the Mount Hood National Forest in Multnomah County.  It joins the Bull Run River at Bull Run Reservoir 1. Fir Creek is a tributary, about 5 mi long, of the Bull Run River in the U.S. state of Oregon.  Part of the system that provides drinking water to the city of Portland, it flows generally northwest through a protected part of the Mount Hood National Forest in Clackamas and Multnomah counties.  It joins the Bull Run River at the upper end of Bull Run Reservoir 1, about 14 mi from the larger stream's confluence with the Sandy River. Manassas National Battlefield Park, located north of Manassas, in Prince William County, Virginia, preserves the site of two major American Civil War battles: the First Battle of Bull Run on July 21, 1861, and the Second Battle of Bull Run which was fought between August 28 and August 30, 1862 (also known as the "First Battle of Manassas" and the "Second Battle of Manassas", respectively).  The peaceful Virginia countryside bore witness to clashes between the armies of the North (Union) and the South (Confederacy), and it was there that Confederate General Thomas J. Jackson acquired his nickname "Stonewall." The SS Bull Run was a type T2 tanker built at Sun Shipbuilding and Drydock Co. in Chester, PA as hull number 287 and USMC number 362 in 1943.  In 1956, the ship was acquired by the US Navy from the Maritime Administration, assigned to MSTS, and placed in-service as the USNS Bull Run (T-AO-156).  It left the navy in 1957, going back to the Maritime Administration.  In 1969, the stern of the Bull Run was attached to the bow of the Type C4 ship the Anchorage, and the completed ship then retained the name Anchorage.  The bow of the Bull Run was then scrapped. The South Fork Bull Run River is a tributary, about 6 mi long, of the Bull Run River in the U.S. state of Oregon.  Part of the system that provides drinking water to the city of Portland, it flows generally west through a protected part of the Mount Hood National Forest in Clackamas County.  It joins the Bull Run River at Bull Run Reservoir 2, about 8 mi from the larger stream's confluence with the Sandy River. Irvin McDowell (October 15, 1818 – May 4, 1885) was a career American army officer.  He is best known for his defeat in the First Battle of Bull Run, the first large-scale battle of the American Civil War.  In 1862, he was given command of the I Corps of the Army of the Potomac.  He fought unsuccessfully against Stonewall Jackson's troops during the Valley Campaign of 1862, and was blamed for contributing to the defeat of United States troops at the Second Battle of Bull Run in August.
Answer: Second Battle of Bull Run