Wallace commanded a company of rangers in defense of the frontier in 1779. He became major of the
Dauphin County Militia in 1796. One of the commissioners of the county from 1799 to 1801, he subsequently served as a member of the
Pennsylvania House of Representatives from 1806 to 1810. Wallace was then elected as a Republican to the
Fourteenth Congress to fill the vacancy caused by the declination to serve of
Amos Slaymaker. Reelected to the
Fifteenth and
Sixteenth Congresses, he declined to be a candidate for renomination and retired to his farm. ==Death and interment==