If you're looking for manga similar to Flower War, you might like these titles.
Six tales of mecha war and redemption. Civil war has broken out on the planet Sodom, and the only way to survive is by using the mechas left behind by a mysterious alien race. The two sides must find common ground in their humanity or they will annihilate each other.
Manga about the Russo-Japanese war. Set in 1904, it follows a special corps of soldiers trained to pilot a steam-powered robot called Brodrov.
Goyo, The girl who is able to hide any trace of herself. Even air raids fail to kill Goyo, who is always the lone survivor. Goyo survived for 10 years on her own after being ostracized when thought to be an evil child. What fate awaits Goyo at the end of her journeys?
Char Aznable, who had gone missing, revives the Neo Zeon Forces and wages war against the Earth Federation government. To change the climatic conditions he’ll drop a meteoroid onto Earth, carried out in order to create an artificial ice age. Many innocent people would be purged at the hand of Char… Amuro Ray, a former rival, stands in the way of Char’s ambitions once again! The original version of the anime’s spectacular masterpiece, Char’s Counterattack!
Half a century ago, the human race was attacked by an enemy from the sea known as the AUS. When Reiji Shiroyama was little, he was unable to protect his sister from the AUS because the gun he tried firing jammed. Since then, Reiji refuses to trust guns and only trusts his fists.
Hyeon Kang, a self-centered high school kid, has to bear the burdening fate of being the master of 'KANGTAWOO', the only robot that can stand against 'Spelta Empire', which seeks to conquer Earth.
70 years since the end of the Korean war, July 27, 1953. 70 years on, a new conflict arises in the Korean peninsula. The powder keg of North East Asia is lit by a small ember...