When did England declare war on Germany? Was it at the invasion of Poland, at the invasion of Belgium, or some time between the two?
Alberto Monteiro England (and France) delivered an ultimatum to Germany that expired 24 hours after German tanks crossed the border into Poland, I believe. When that ultimatum expired without the Germans retreating back across their border, a state of war existed between the countries. This leads to the remarkably bizarre fact that WW2 is coded in most social science databases as a war begun by _England_, since they declared war without being directly attacked. Gautam
