Fort Slemmer, Northeast Quadrant of the Northern Defenses, in Washington DC.
Summary
2nd Pennsylvania Heavy Artillery at Fort Slemmer.
Perhaps the most vivid image of the Defenses of Washington in regards to design and structures, including the curtain walls, parapet, sallyport (rear exit), ditch, and abatis (barrier of felled sticks outside of the fort's ditch). Fort Slemmer was named in honor of Lieutenant Andrew Slemmer, commander of Fort Pickens.
A very large dataset of various big guns, howitzers, mortars, columbiads, all types of canon-like things - everything besides machine guns and rockets. This collection as well as all massive collections on Picryl.com required two steps: First, we picked a set to train AI vision to recognize cannon artillery, and after that, ran all 25M+ images in our database through our image recognition network. All media in the collection is in the public domain. There is no limitation on the dataset usage - educational, scientific, or commercial.
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