After the war , Jackson studied law , was admitted to the bar in 1867 and commenced practice in New Castle , Pennsylvania . He served as district attorney from 1868 to 1871 . He was a member of the commission to codify laws and devise a plan for the government of cities of Pennsylvania in 1877 and 1878 . He published a book The fiery trail : a Union officer 's account of Sherman 's last campaigns Jackson was elected as a Republican to the Forty-ninth and Fiftieth Congresses . He was an unsuccessful candidate for renomination in 1888 . He resumed the practice of law in New Castle and was a delegate to the 1896 Republican National Convention
1896 Republican National Convention
1896 Republican National Convention
Oscar Lawrence Jackson