SKDitta, Carrying the mythology of those swords into modern warfare is stretching it, let us keep it in the "talking snake book" shall we? The bible story identifies the swords at Eden's entrances to be repellent to the access to the tree of life watered by the river. in Rev 20/21, the denouement, The gates are guarded by angels again, barring the access to the river, and trees of life, for the unworthy. so, River in Eden, River in the 1000 year paradise.
impossible rivers, as this thread showed.