A group of cats is actually called a clowder or a clutter, so no, it's not possible to guard it with a "herd" of cats. However, it would be possible to guard it with a clowder/clutter of cats, assuming the cats aren't likely to destroy the pillow fort or just leave.
Battle of Fort Pillow happened on 1864-04-12.
a pillow fort
a pillow fort or a big pillow fight
fort where black Union soldiers were massacred after surrendering
cause it did
Fort York Guard was created in 1934.
Make a pillow fort, or a cake.
Fort Pillow
Fort Pillow
fort pillow
Fort Pillow
Fort Wayne Air National Guard Station was created in 1941.