... had invented. A centrifugal steam gun invented by Mr. Dickinson was purchased by the city to be used in the public defense. A party of young men took some field pieces from a military school at Catonsville and brought them to town, but the principal of the school, a clergyman and a strong Union man, had spiked them. The militia were called out, and 15,000 citizens were enrolled and put under the co...