<P> France and the UK declared war on Germany on 3 September , but failed to provide any meaningful support . The German - French border saw only a few minor skirmishes , although the majority of German forces , including 85 % of their armoured forces , were engaged in Poland . Despite some Polish successes in minor border battles , German technical , operational and numerical superiority forced the Polish armies to retreat from the borders towards Warsaw and Lwów . The Luftwaffe gained air superiority early in the campaign . By destroying communications , the Luftwaffe increased the pace of the advance which overran Polish airstrips and early warning sites , causing logistical problems for the Poles . Many Polish Air Force units ran low on supplies , 98 of their number withdrew into then - neutral Romania . The Polish initial strength of 400 was reduced to just 54 by 14 September and air opposition virtually ceased . </P>
<P> France and the UK declared war on Germany on 3 September , but failed to provide any meaningful support . The German - French border saw only a few minor skirmishes , although the majority of German forces , including 85 % of their armoured forces , were engaged in Poland . Despite some Polish successes in minor border battles , German technical , operational and numerical superiority forced the Polish armies to retreat from the borders towards Warsaw and Lwów . The Luftwaffe gained air superiority early in the campaign . By destroying communications , the Luftwaffe increased the pace of the advance which overran Polish airstrips and early warning sites , causing logistical problems for the Poles . Many Polish Air Force units ran low on supplies , 98 of their number withdrew into then - neutral Romania . The Polish initial strength of 400 was reduced to just 54 by 14 September and air opposition virtually ceased . </P>
country that with england declared war on germany after the german invasion of poland
country that with england declared war on germany after the german invasion of poland
France
France