Your numbers are meaningless. The German weapons were modern. The French were not and the UK&#x27;s were virtually non-existent.<p>The UK had no reason to declare war in 1939 other than their promise to defend Poland. We went into a global war that lasted 6 years, took half a million of our lives, bankrupted us and caused us to lose a global empire (well that was a good side effect). Bear in mind that this was ~20 years after a previous war after which the general view in the UK was that we would never fight another.