This seems like a Catch-22 situation.
The original point was how to build your reputation at the beginning. Even if we assume you had some brilliant strategic ideas (which I still doubt, but let’s assume you had), how would you convince them to let you, a random stranger, become their advisor?
You will need to be trusted to be allowed to lead their army, but you intended to achieve a brilliant victory to become trusted.
This seems like a Catch-22 situation. The original point was how to build your reputation at the beginning. Even if we assume you had some brilliant strategic ideas (which I still doubt, but let’s assume you had), how would you convince them to let you, a random stranger, become their advisor?
You will need to be trusted to be allowed to lead their army, but you intended to achieve a brilliant victory to become trusted.
No, it wasn’t. The OP specified (see point (3)) that you could have all the resources you need just for asking.