Downtrodden Noble, the Lifting Cavalry You Raised

Time travel to a baron family, both parents died. Territories were annexed. After re-searching for a new territory and completing the construction, he joined the battlefield to defend the country. After going through the ruthless training of the battlefield, he relied on his own efforts to become a noble viscount, helping the country win countless victories. His title was also constantly improved, his army continued to expand, and his territory continued to expand, becoming a general with more than ten thousand people under one person.