Netorare Tsuihou sareta Saikyou Kishi Danchou no Ossan, Katainaka de Eiyuu ni Matsuriagerareru

For years, the commander of the knights, Warrena, has contributed to keeping the kingdom's peace. Though he survived a year-long campaign, his fiancée, the third princess, cheated on him and has gotten pregnant. In order to cover up the family scandal, the royal family declares that Warrena died during the campaign. He gives up on his kingdom out of despair and decides to use his compensation money to live a slow and leisurely life in the countryside. One after another, he encounters a saint and a fox girl, and they eventually end up falling for him. However, he himself has a reason why he can't fall in love with them...? A fantasy story about the rise of the strongest old man exiled from the kingdom!! (Source: Futabasha, translated)