<P> The only Polish raid against a target in Germany was executed by PZL. 23 Karaś light bombers against a factory in Ohlau . The Polish air force left Poland on 18 September 1939 due to the Soviet attack on 17 September 1939, and imminent capture of the Polish airstrips and aircraft stationed in eastern parts of Poland . There was no exception; even Pursuit Brigade, an organic part of the defences of the Polish capital, Warsaw, was transferred to Lublin, one week into the war . </P> <P> On 3 September 1939, following the German invasion of Poland, the United Kingdom and France declared war on Germany and the war in the West began . The RAF bombed German warships and light vessels in several harbours on 3 and 4 September . Eight German Kriegsmarine men were killed at Wilhelmshaven--the war's first casualties to British bombs; attacks on ships at Cuxhaven and Heligoland followed . The 1939 Battle of the Heligoland Bight showed the vulnerability of bombers to fighter attack . </P> <P> Germany's first strikes were not carried out until 16 and 17 October 1939, against the British fleet at Rosyth and Scapa Flow. Little activity followed . Meanwhile, attacks by the Royal Air Force dwindled to less than one a month . As the winter set in, both sides engaged in propaganda warfare, dropping leaflets on the populations below . The Phoney War continued . </P> <P> The British government banned attacks on land targets and German warships in port due to the risk of civilian casualties . For the Germans, the earliest directive from the Luftwaffe head Hermann Göring permitted restricted attacks upon warships anywhere, as well as upon troop transports at sea . However, Hitler's OKW Direktive Nr 2 and Luftwaffe Direktive Nr 2, prohibited attacks upon enemy naval forces unless the enemy bombed Germany first, noting, "the guiding principle must be not to provoke the initiation of aerial warfare on the part of Germany ." </P>

German city not bombed in world war 2