In point of time underground work seems to have developed first in eastern Pennsylvania.[367] Regular routes of travel began to be formed in the vicinity of Philadelphia about the middle of the first decade of the present century. It is said that "some cases of kidnapping and shooting of fugitives who attempted to escape occurred in Columbia, Pa., in 1804. This incited the people of that town, who were chiefly Friends or their descendants, to throw around the colored people the arm of protection, and even to assist those who were endeavoring to escape from slavery.... This gave origin to that organized system of rendering aid to fugitives which was afterward known as the 'Underground Railroad.'" Thus begun, the service rapidly extended, being greatly favored by the character of the population in southeastern Pennsylvania, which was largely Quaker, with here and there some important settlements of manumitted slaves. It was on account of the large number of runaways early resorting to Columbia that it became necessary to have an understanding with regard to places of entertainment for them along lines leading to the Eastern states and to Canada, whither most of the fugitives were bound.[368] There seems to have been scarcely any limitation upon the number of persons in Lancaster, Chester and Delaware counties willing to assume agencies for the forwarding of slaves; hence this region became the field through which more routes were developed in proportion to its extent than any other area in the Northern states. It will be necessary to make use of a special map of the region in order to follow out the principal channels of escape and to discover the centres from which the Canada routes sprung.[369] West of the Susquehanna River Gettysburg and York were the stations chiefly sought by slaves escaping from the border counties of Maryland. Along the western shore of the Chesapeake runaways passed northward to Havre de Grace, where they usually crossed the Susquehanna, and with others from the Eastern Shore found their way to established stations in the southern part of Lancaster and Chester counties in Pennsylvania. From the territory adjacent to the Delaware the movement was to Wilmington, and thence north through Chester and Delaware counties. The routes developed in the three regions just indicated formed three systems of underground travel, the first of which may be called the western, the second, the middle, and the third, the eastern system. These systems comprised, besides the main roads indicated in heavy lines upon the map, numerous side-tracks and branches shown by the light lines. Their common goal was Phœnixville, the home of Elijah F. Pennypacker, and from here fugitives were sent to Philadelphia, Norristown, Quakertown, Reading and other stations as occasion required. While Phœnixville may be regarded as the central station for the three systems mentioned, it did not receive all the negroes