To my knowledge, there has not been a major war where both countries involved were led by female heads of state.

This market explores historical conflicts, questioning whether there has ever been a war between two sovereign nations simultaneously led by women. Given the rarity of female leadership in the highest offices historically, this market seeks to confirm or refute the occurrence of such an event.

It will resolve to "Yes" if evidence emerges of any past conflict meeting these criteria. Otherwise, it will resolve to "No."