Anderson served in Capt. Jesse Billingsley's Company in the battle of San Jacinto, where he was wounded in the ankle. Several years later John Osburn Nash was quoted in the Houston Chronicle: "The old pioneer Wash Anderson was the true hero of San Jacinto, although history gives him no praise. Wash was never known to shout `go on' in battle, but was always known to say `come on' instead. He had more to do with turning the tide of the battle than Sam Houston did." Anderson is pictured in William H. Huddle's painting The Surrender of Santa Anna, which hangs in the Capitol in Austin. He also fought in the battle of Brushy Creek in 1839. The Andersons received several land grants for service.
On March 25, 1838, Anderson married his cousin Mary Ann Glascock. They had one daughter. Anderson, a devout Baptist, a Democrat, and a successful businessman, circulated and signed the petition to form Williamson County in 1848. He was one of the first county commissioners there. He built the county's first sawmill and gristmill and was one of the most prominent settlers of Round Rock, where he sold land to have the town platted. He also sold the land for the first college in the county, Greenwood Institute. After living in several log houses, the Andersons built a large rock house with separate slave quarters in 1859. The home is still standing on Brushy Creek in Round Rock; it received a Texas historical medallion in 1962. The Andersons were active in state affairs, especially the Texas Veterans Association. Wash Anderson died in 1894 and was buried in Oakwood Cemetery, Austin.
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