But a higher percentage of the population died during the Bubonic Plague, with estimates ranging from 30% to 60% of the total population died from the Black Death.
It varied widely even within countries. Remember, this hit about two decades into the hundred years war (1337-1453) which was a mixture of hot and cold wars.
Entire villages in the French mainland were wiped out where another village just a few miles away might be nearly unscathed. At the beginning of the war, the Kingdom of France covered the area around Paris plus most of the southern and eastern provinces (close to the World War II boundaries of Vichy France). Normandy and Norman-English aligned provinces covered most of the North and West. Joan of Arc was betrayed and sold to the English by Burgundy, a province of modern France. Scotland was allied with the French.
By the time it ended, England controlled little more than the enclave around Calais on the French mainland (plus the Islands of Jersey and Guernsey). So the reality is that the French won.
But the plague, even more than the war, reduced the population of Europe so much that Feudalism begin to crumble and was replaced by the renaissance and a rising middle class as worker wages were bid up. The war would continue unabated (save for normal periods of cold war) for most of the next 100 years, but transformative die was cast more by the plague itself than subsequent events in the war, including the stunning English victory at Agincourt (1415) and the Treaty of Troyes (1420), which seemingly ended the war in England's favor. Then along came Joan of Arc.