did the place witness any war?
Yes, the Battle of the Pelennor Fields.
Rohan (Middle-earth)
héoden then rode with his army to Minas Tirith, helping to break its siege in the Battle of the Pelennor Fields and killing the leader of the Haradrim, but was killed when his horse fell. He was succeeded by his nephew Éomer. His niece Éowyn killed the Lord of the Nazgûl.

where is rohan in lord of the rings It is bordered to the north by the Fangorn forest, to the northeast are the walls of Emyn Mui, to the east are the mouths of the River Entwash, and the Mering Stream, to the south lie the White Mountains and to the west are the rivers Adorn and Isen. how did it get it's name? Tolkien used Old English for the kingdom's language and names. which is it's capital city? Edoras. which language is spoken there? Rohirric or Rohanese. has it appeared in any form of art? UNANSWERABLE what kind of people can we find here? They have an Anglo-Saxon culture and language, with Gothic attributes. what different animals can be seen here? Horses.
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Rohan (Middle-earth) [SEP] War of the Ring
Saruman used his influence through the traitor Grima Wormtongue to weaken Théoden. Saruman then launched an invasion of Rohan, with victory in early battles at the Fords of Isen, killing Théoden's son, Théodred. Saruman was defeated at the Battle of the Hornburg, where the tree-like Huorns came from the forest of Fangorn to help the Rohirrim. Théoden then rode with his army to Minas Tirith, helping to break its siege in the Battle of the Pelennor Fields and killing the leader of the Haradrim, but was killed when his horse fell. He was succeeded by his nephew Éomer. His niece Éowyn killed the Lord of the Nazgûl.