To be honest, describing such a walkthrough is quite enjoyable. In the heat of battle (read: the walkthrough), you don't even notice the whirlwind you've created. I sometimes surprise myself.:)
If you give me your save file for day 6 now, and the ready-made scroll for water, I still won't understand how I can capture 7 castles in the remaining 4 days.
Now it will be much easier for you (without the remaining 2 days) to solve this heroic puzzle.;)
I'll try not to put off the remaining two for too long.;)