Orngebeard

After becoming #1 in the world after playing a grand strategy game as the most difficult faction on immortal level difficulty, MC receives an invitation to compete in an even more challenging game which takes the MC into the world of the game itself, but as it's weakest lord who will die two days later that appears only as a cutscene in the tutorial as first of many deaths to rock the continent until only one survives to proclaim a new eternal empire.

Can the MC use his game knowledge to successfully survive his impending doom, and rise from the ashes to reclaim the glory he'd won before?

Imperator: Resurrection of an Empire

The warships had traversed the sea and their docking at the port city of Tideshore was being conducted, as the city had already fallen under their control this time around Julius and Zeff could watch the docking proceeding as they slowly slipped their way into the harbour.

The men who once more glad to be on dryland save for a few who asked for leave from the army to continue training under the sailors as the first Latinium naval forces to which Julius readily gave them permission.

These initial trainees would be invaluable as a series of naval academies were planned to train up proper sailors but aside from Carthage trainers would be needed so having experienced soldiers dually trained in naval tactics could allow for the formation of a marine squad, one trained for both land and sea combat.

An elite assault force If you will just like the Marines of Earth.

Tideshore's Transformation