The New War Map Virginia Maryland Pennsylvania

A Map from about 1864,  Not only is Delmar not shown but Delaware isn't even included in the title 

an enlarge view of the area we are interested in.  No Delmar but not surprising as Delmar would have been an open field in a Pine Forest with nothing beyond the rail track and a depot.  It would not be until the 1870s building finally started to pop up.

Notice below Easton on the map is the "Hole in the Wall"  Today just the ruins of the church is there, just off RT50