What was a strategic intention for building Bitchu-Takamatsu Castle?
Its placement in a swamp, in a basin surrounded by mountains might on three sides made the castle impregnable, but also quite inconvenient for any offensive use or territorial defense. Or am I wrong?
My only idea is the nearby Matsuyama Road, but still it doesn't look like the castle protected it.
Why the castle was built in a way that seemingly seems to allow cutting it off by a small contingent?
If not military was there any political significance then?