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"Do you really wish to know?"
Spoilers from the books and/or adaptations to follow!

Battle for Marnadal valley was a battle in First Nilfgaard War. The participants were Nilfgaardian and Cintran forces. The defeat of Cintra's forces caused the capturing of their country by the Nilfgaard empire. Cintra's army showed up in the valley but it was surrounded by overwhelmingly larger army of Nilfgaard, and was almost completely destroyed. Both Eist Tuirseach and Calanthe, king and queen of Cintra, participated in the battle. Eist was killed but Calanthe gathered everyone she could under her own banner and broke her way through enemy forces and retreating back to Cintra. According to the Dandelion's recounting, the Cintran army fought very bravely even though the chances of victory were slim, from dawn to dusk.

The next major battle was the Slaughter of Cintra.

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