If you're looking for manga similar to Alderamin on the Sky, you might like these titles.
Princess Yona lived a happy life with her peace-loving father, King Il. Surrounded by attentive servants and protected by her smart-mouthed bodyguard, Hak, Yona's only difficulties in life were her unruly red hair and trying to convince her father to let her marry her cousin, Soo-wan. Then one day a betrayal in the palace causes Yona to lose everything, turning her into an exile with no one left but Hak to defend her. Yona is determined to become strong in her own right and defeat those who wronged her, and an ancient legend involving the Crimson Dragon King and his four Dragon Warriors may be her key to reclaiming her kingdom.
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They are both of a past kind of setting, involving wars amongst kingdoms at that time. Involve nice battle strategies inorder to out smart the other party and have nice story lines
Having lost his money, lover, and future, a man who has given up on everything finds himself reincarnated in the kingdom of Altodestenia. He, Lectival, has no memories prior to being saved by Meriela, the daughter of an aristocrat, and now finds himself rising up to save the kingdom in its current crisis.
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Both take place in middieval europe-like societies and focus on military growth/expansion. Both manga have a political focus and interesting characters, though in my opinion Nejimaki is way too short.
Regis Ulrich is an incapable soldier; bad at both sword and archery, who passes the time by only reading books. While transferring to a remote region post, he meets a girl who turns out be the red hair and crimson eyed princess Altina, the wielder of the Supreme Ruler's Sword. Despite being only fourteen years old, she was appointed to become the commander of the army in the remote region simply because she was the illegitimate child of the Emperor. However, she continues to hold onto her dreams of becoming Empress despite the circumstances that surrounds her. To achieve this goal, she asks Regis to become her tactician and stand alongside her against the obstacles they are sure to face.
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If you liked this, you'd definitely like this! Both these manga follow talented strategists who used their cunning and wisdom to survive the battles in war they face alongside their sword welding heroine.
On the island of Wakoku, the civil war offers anyone the chance of becoming a hero -- from fishing women to bastard children, any can make a name for themselves by working through the rigorous ranks of the army. Hinowa, a young woman with extraordinary skills, is determined to do just that, but soon learns things may not always go to plan...More than ten years after a disastrous battle, the war is still ongoing, and a girl with black hair and black markings washes up on shore...
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If you liked this series, you may also like this one! Both feature characters fighting in large scale fantasy wars between countries!
Once upon a time, in a forgotten temple in the middle of a deep, dark forest, a god of death stumbles across a baby girl called Olivia and takes her in to raise as its own. Under the death god’s tutelage, little Olivia spends her days studying to become a brilliant tactician and master of the blade. But her destiny changes irreversibly upon her fifteenth birthday. When the death god suddenly vanishes, Olivia must leave the forest and make for the battlefield! But none of her books or drills have prepared her for other people—nor for the fearsome war between a mighty empire hellbent on uniting the continent and a kingdom struggling to maintain its autonomy as the last remaining holdout against the imperial conquest. What Olivia lacks in social skills she makes up for with martial prowess, and when she arrives on the scene, no one on either side will know what hit them. As she searches for her missing teacher and fends off the empire, the epic tale of Olivia and her ebony blade begins!
Civil war continues to wage on the island nation of Alistria. The Waldrons lead a small arms shop on this island when they receive a large order of rifles from the army. However, this turns out to be a ploy by the colonel who made the order. He uses his ties to the rebel army to have them ransack the shop. Having her husband killed, her daughter taken away and her own left eye lost, Sophia decides to take the only remaining sniper rifle and sets out for revenge.