SITGREAVES, Samuel, lawyer, born in Philadelphia, Pennsylvania, 16 March, 1764 ; died in Easton, Pennsylvania, 4 April, 1824. He received a classical education, studied law, and was admitted to the bar in Philadelphia, 3 September, 1783. In 1786 he settled at Easton, where he soon gained an extensive practice. He was elected a member of the State constitutional convention of 1789-'90, and was elected to congress in 1794, and again in 1796. In 1797 he conducted the impeachment of William Blount. He was one of the commissioners to settle claims under the Jay treaty. In 1799 he was retained by the government to assist in the trial of John Fries for treason. At the end of John Adams's administration he retired from politics, and resumed practice.--His son, Lorenzo, soldier, born in Pennsylvania about 1811: died in Washington, D. C., 14 May, 1888. He was graduated at the United States military academy in 1832, and was assigned to the artillery. He resigned to engage in civil engineering, but was reappointed in the army as 2d lieutenant of topographical engineers on 18 July, 1840, and was employed in surveys of the Sault Sainte Marie, Portsmouth harbor, and the Florida reefs. During the Mexican war he took part in the march through Chihuahua and in the battle of Buena Vista, where he gained the brevet of captain for gallantry. He was in charge in 1851 of the survey of Zufii and Colorado rivers, New Mexico, of which a report was published (Washington, 1853). He mustered volunteers at Albany, New York, in 1861-'2, being promoted major on 6 August, 1861. He reached the grade of lieutenant-colonel of engineers on 22 April, 1864, and subsequently had charge of harbor improvements on Lake Michigan till 10 July, 1866, when he was retired.