Usage patterns
戦いに勝つto win a battle/fight
They won the long battle.
戦いに負けるto lose a battle/fight
He ended up losing that battle.
戦いが始まるfor a battle/struggle to begin
The battle began at dawn.
〈相手〉との戦いa struggle/fight against someone or something
The struggle against the illness continued for a long time.
戦いを続けるto keep up a struggle/fight
She keeps fighting against poverty.