 Fourth President James Madison called Petersburg "Cockade of the Union" (which later was applied to the town as a nickname "Cockade City"), in honor of the cockades which Volunteers wore on their caps.Because of the availability of jobs in Petersburg, many free blacks in Virginia migrated to the growing urban community.They established First Baptist (1774) and Gillfield Baptist Church (1797), the first and second oldest black congregations in the city and two of the oldest in the nation.