A Gentlemen's Duel (2006) on Netflix

In a lovely garden on a peaceful afternoon, two frogs vie for same butterfly, a harbinger of what's to come. At a grand manor, a woman in elegant dress with ample décolletage is courted by a two gentlemen, the Marquis de Malstrumpet and Sir Dingleberry. They spar verbally, argue over the food and drink, knock her about without noticing, and then escalate to a full-fledged dual between two gigantic robots that each pilots from inside the helmet. Destruction reigns supreme across manor and garden. Will there be a last man standing? And what about the lady?