According to Wright's The Continental Army, The Delaware regiment was recruited in Kent, Sussex and New Castle Counties. New Castle county (1770's) borders Pennsylvania, so I would think a nearby farmer could join his friends.
There are unit records from the Delaware Regiment that can be viewed on microfilm. See our unit records page: http://www.revwar75.com/ob/m246.htm on the Continental Army Orderly Book Index pages of the Revwar75 website.
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