From Wiktionary, the free dictionary
From mid- + battle.
midbattle (not comparable)
- During a battle.
2015 September 14, James Poniewozik, “Review: In ‘The Bastard Executioner,’ a Warrior Switches Blades”, in New York Times[1]:An opening flashback finds him midbattle, blades flying and cabernet-red blood gushing to the roar of power chords.