While many blacks who arrived in Nova Scotia during the American Revolution were free, others were not. Black slaves also arrived in Nova Scotia as the property of White American Loyalists. In 1772, prior to the American Revolution, Britain outlawed the slave trade in the British Isles followed by the Knight v. Wedderburn decision in Scotland in 1778. This decision, in turn, influenced the colony of Nova Scotia. In 1788, abolitionist James Drummond MacGregor from Pictou published the first anti-slavery literature in Canada and began purchasing slaves' freedom and chastising his colleagues in the Presbyterian church who owned slaves. In 1790 John Burbidge freed his slaves. Led by Richard John Uniacke, in 1787, 1789 and again on January 11, 1808, the Nova Scotian legislature refused to legalise slavery. Two chief justices, Thomas Andrew Lumisden Strange (1790–1796) and Sampson Salter Blowers (1797–1832) waged "judicial war" in their efforts to free slaves from their owners in Nova Scotia. They were held in high regard in the colony. By the end of the War of 1812 and the arrival of the Black Refugees, there were few slaves left in Nova Scotia. (The Slave Trade Act outlawed the slave trade in the British Empire in 1807 and the Slavery Abolition Act of 1833 outlawed slavery altogether.)