The 150th anniversary of the First Battle of Manassas will be commemorated this week. Among the events:

Anniversary of the First Battle of Manassas

Beginning with a morning ceremony on Henry Hill on the anniversary of the battle, the National Park Service hosts four days of living history demonstrations with musket and artillery drills, guided tours of the battlefield, hands-on family activities and a concert by the Marine Corps Band. For a full schedule, visit www.nps.gov/mana.

Daily Thursday to Sunday, July 21 to 24. Manassas National Battlefield Park, 12521 Lee Hwy., Manassas. 703-361-1339. www.nps.gov/mana. $3 for those 16 and older (good for three days; Thursday is free); free for those younger than 16.

Civil War baseball

Play baseball — sorry, “Base Ball” — as soldiers did in camp while awaiting orders. Watch a free 28-team baseball tournament using 1860s rules.

2 to 8 p.m. Friday, July 22; 9 a.m. to 8 p.m. Saturday, July 23; 9 a.m. to 5 p.m. Sunday, July 24. Jennie Dean Elementary School, 9601 Prince William St., Manassas. Free.

Civil War parade

Civil War reenactment groups from across the country will parade through Old Town Manassas.

10 a.m. Friday, July 22. www.manassascivilwar.org. Free.

Battle reenactment

More than 8,300 reenactors converge on Prince William County for this two-day event on private land, with parking at Jiffy Lube Live. Beyond the battle, there will be talks with reenactors in character, brass-band concerts, lectures on medicine and slavery, children’s games of the 1860s, and, on Sunday morning, 1850s-style Protestant and Catholic church services.

7 a.m. to 3 p.m. Saturday and Sunday, July 23 and 24. Parking at Jiffy Lube Live, 7800 Cellar Door Dr., Bristow. 703-396-7130. www.manassasbullrun.com. Adult tickets: $40 bleacher seating or $24 standing per day. Ages 6 to 12: $31 seated, $15 standing per day.

Sisterhoodof Spies

In the weeks leading up to Manassas, Confederate spy Rose O’Neal Greenhow sent a steady stream of information to Gen. P.G.T. Beauregard, including the date of the Union advance, from her home at 16th and H streets NW. A Spy Museum program about female spies features historian Ann Blackman. Other women discussed include Antonia Ford — a Confederate spy who married an owner of the Willard Hotel — and Richmond-based Union spy Elizabeth Van Lew.

Tuesday, July 26. Willard Intercontinental, 1401 Pennsylvania Ave. NW. 202-393-7798. www.spymuseum.org. $25.

— Fritz Hahn