Please help with another title…

Hi, I’m trying to find my years of manga (it will take months I suppose)… there is a manga with a weak noble that escaped from his mansion when there was an army and he ended dead after years of poverty. Than he return at that exact moment with his experience and decide to resist and try to negotiate with the commander of the army. The commander begin to have respect for him. With his memories he solve some arising problem for his people and the coltivations. Then he has to go on a journey for the capital and he is escorted by the commander and his army. They have some problem with monsters and they are separated and try to go to the capital alone conealing their identities (the noble decide to cut his long blonde hair to gain some money)…
A long summary, sorry xD