The phrase "conquer back" is correct and usable in written English.
You can use it when you want to describe a situation in which someone takes back control of something that has been lost, or taken away. For example, "After a long battle, the king was able to conquer back his kingdom."
If we really wanted to, we always have the option of just conquering back the land and killing them all.
Samy Kamkar — developer of projects like that massive worm that conquered MySpace back in 2006, or SkyJack, the drone that hijacks other drones — has released a video demonstrating the abilities of a particularly ridiculous "necklace" he sometimes wears around.
By the spring of 1266, however, Stephen V had established himself as the sole ruler of Hungary, and on 23 June 1266, conquered Vidin back from Jacob after a brief siege.
Its owner, Massimo Moratti, is the son of an Inter president whose team did conquer Europe, way back in the 1960s.
According to one of the many Greek legends about the Constantinople's fall to the Ottomans, when the Turks entered the city, an angel rescued the emperor Constantine XI Palaiologos, turned him into marble and placed him in a cave under the earth near the Golden Gate, where he waits to be brought to life again to conquer the city back for Christians.
"Rise and conquer," he says, pulling back his T-shirt to show me.
Refusing to rely on his rubber body and stony face to conquer Hollywood, Keaton pushed back the boundaries of film-making itself.
Right now, tho, better to divide & conquer, so I'm back to sleeping at factory.
If Sweden decides to come back and conquer Latvia, they will be happy to oblige Swedish law in exchange for Swedish citizenship and the rights that people have here.
So to pull all this logic together, God anoints priests to work in the church directly and kings to go out into the marketplace to conquer, plunder, and bring back the spoils to the church.
