Press space when attacking a house. The faster you click the more slaves you gain.
The frame rate on Scratch is slow so if you press space to quickly it won't register the key being released. Sources: “Census 1830.” Social Explorer, http://www.socialexplorer.com/5096b7de9a/view “Nat Turner’s Rebellion.” PBS, http://www.pbs.org/wgbh/aia/part3/3p1518.html History.com Staff. “Slave Revolt Erupts in Virginia.” History.com, 2010, http://www.history.com/this-day-in-history/slave-revolt-erupts-in-virginia. History.com Staff. “Nat Turner.” History.com, 2009, http://www.history.com/topics/black-history/nat-turner “Nat Turner’s Insurrection.” The Atlantic, August 1861, https://www.theatlantic.com/magazine/archive/1861/08/nat-turners-insurrection/308736/ Turner, Nat. “The Confessions of Nat Turner, The Leader of the Late Insurrection In Southampton, VA.” Doc South, 1831, http://docsouth.unc.edu/neh/turner/turner.html US Government. “Statistics of Slaves.” 1860. PDF, https://www2.census.gov/prod2/decennial/documents/00165897ch14.pdf Graham, H. S, and E Hergesheimer. Map of Virginia: showing the distribution of its slave population from the census of 1860. Washington: Henry S. Graham, 1861. Map. https://www.loc.gov/item/2010586922