Regressor of the Fallen family is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on regressorofthefallenfamily.com fastest updating comic site. The Summary is

Logan MacLine, a middle-aged knight fighting for the independence army, is intent on getting revenge against the empire which took over the kingdom and executed his brother when he ends up dying in battle. But when he wakes, he is a young man again, and has yet to be disowned for his terrible behavior. Using his experience and knowledge from his past life, Logan recruits a few talented individuals to develop new weapons, build an army, and make enough money to fund it all. But will he be able to make amends with his family and stop the empire’s march?