> You can very well replace "fortress" with "battleship" and the idea is the same.
No, you can't, because the battleship can move and attack your supply lines.
Battleships won the first world war. Not because of any engagement they participated in, but because the Royal Navy stopped German merchant shipping entirely, while the Kriegsmarine only managed to harass British shipping. You cannot go around a battleship when one of the primary points in it's design is to be fast enough to interdict anyone.
No, you can't, because the battleship can move and attack your supply lines.
Battleships won the first world war. Not because of any engagement they participated in, but because the Royal Navy stopped German merchant shipping entirely, while the Kriegsmarine only managed to harass British shipping. You cannot go around a battleship when one of the primary points in it's design is to be fast enough to interdict anyone.