I Transmigrated as a Major, but Nobody Asked You to Become a Marshal

Transmigrated into the lowest-ranking major on the empire's frontier, he has no troops and barely a coin to his name. While others play politics, he secretly builds factories. While others obsess over appearances, he builds high walls, stores grain, and bides his time before claiming the throne. Then the empire collapses and powerful enemies come knocking. As everyone else panics, he finally bares his fangs. “Sorry, but my steel tide has been waiting for you for a long time.”