Coehoorn met his defeat at the Battle of Brenna. The reconnaissance units he sent out before the battle failed to notice the Nordling reserves under voivodes Bronibor and Blenckert. These units tipped the scales in favor of the Nordlings and Coehoorn was forced to flee. During his retreat, he was shot to death by the remnants of Zoltan Chivay's company, his body left in the swamp.
- The character was named after Menno, baron van Coehoorn, a 17th-century Dutch soldier and military engineer.
- Coehorn refused to escape with the same words as Polish Crown Grand Hetman (general) Stanisław Żółkiewski, conqueror of Moscow and one of the greatest Polish commanders, who died in Battle of Cecora against Tartars.
- It is also rumoured that he hanged himself, and that his spirit uses the words of Julius Ceasar: Give me back my legions. Possibly another reference to Nilfgaard being like the Roman Empire.