It Starts With A Mountain 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 www.mgeko.nl fastest updating comic site. The Summary is

It starts with a mountain. A strategic leader gets isekai-ed into a war dynasty. He only has a group of members who were planning to ditch him. Facing this war era, he thinks of stealing food and girls to live a king’s life. He is hot-blooded, picks fights with war heroes. How will he bring chaos to the war? Will he be able to rise up high?