GREENCASTLE

Latter Day Saint settlement

In 1845, following the succession crisis in the Latter Day Saint movement, Sidney Rigdon (one of the three main contenders along with James Strang and Brigham Young for leadership of the Latter Day Saints following the death of Joseph Smith) took his followers to Pennsylvania and formed a Rigdonite Mormon settlement at Greencastle. This settlement had approximately 200 followers. They founded the New Jerusalem settlement between Greencastle and Mercersburg, published the Conochoheague Herald newspaper in Greencastle, and made plans for the construction of a temple. The Rigdonite Mormon settlement at Greencastle only lasted a few years; some former Rigdon followers went to Utah to join Brigham Young, while William Bickerton, who had opposed Rigdon's move to Greencastle, would eventually reorganize the remaining Pennsylvania branch of the Latter Day Saint movement in Pittsburgh as the Church of Jesus Christ (Bickertonite).

Civil War

Early in the Civil War, Greencastle and neighboring Franklin County communities raised the 126th Pennsylvania Infantry. In the summer of 1863, the war touched close to home when Confederate General Robert E. Lee and his Army of Northern Virginia invaded southern Pennsylvania during the Gettysburg campaign. From mid-June to early July, those residents of Greencastle who had not fled to safety lived under Confederate rule. On July 2, concurrent with the Battle of Gettysburg in neighboring Adams County, Captain Ulric Dahlgren's Federal cavalry patrol galloped into Greencastle's town square, where they surprised and captured several Confederate cavalrymen carrying vital correspondence from Richmond. After the Battle of Gettysburg, Lee's army began its retreat to Virginia on July 4 and 5. He sent John D. Imboden's cavalry to escort a large wagon train carrying Confederate wounded. The train, nearly 18 miles (29 km) in length, wound its way through the streets of Greencastle, where a few men of the town attacked the wagon train with axes and hatchets. They succeeded in disabling several wagons before Confederate cavalry chased them away.

Modern era

Following the war, Greencastle grew considerably in the late 19th century during the Industrial Revolution, having several industrial factories built inside the town limits, including the Crowell Manufacturing Company, which constructed farming equipment.

In 1902, Greencastle businessman Philip Baer began a tradition where the town holds a triennial social event known as "Old Home Week". Every three years, Greencastle townspeople and former residents come together for one week in August in a town-wide reunion to reminisce and fellowship. Baer performed prolifically in a minstrel show which included the use of blackface. As recently as 2013, the program has featured a "modern minstrel." The most recent Old Home Week Celebration occurred in 2022; the next one will be in 2025.

The Greencastle Historic District, Mitchell-Shook House, and Martin's Mill Bridge are listed on the National Register of Historic Places.

Greencastle contains many Christian church congregations with longstanding heritage and rich history. The present-day Methodist church has origins dating back to 1805 when Christian Newcomer conducted services in the area.