"Fort Bowman" is actually just a house. But it's an important one.

The house Colonel Abraham Bowman grew up in still stands near Strasburg, Virginia. It is a very important early example of Pennsylvania German architecture in the Shenandoah Valley. Built by his father about 1753, the house has been called “Harmony Hall” since before the Revolutionary War. It is sometimes, however, called “Fort Bowman” because it was used as a fort during the French and Indian War. In 2009, Maral Kalbian and Margaret Peters gave a presentation on the house’s history. Parts 1 through 3 cover the chain of property ownership. If you are not interested in that, you may want to start watching with part 4--which is embedded here. The house is now on property that is part of Cedar Creek & Belle Grove National Historical Park.
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