The Battle of Mokra took place on 1 September 1939 near the village of Mokra, 5 km north of Kłobuck and 23 km north-west of Częstochowa, Poland. It was one of the first battles of the Invasion of Poland, during the Second World War, and was one of the few Polish victories of that campaign and the first German defeat of the conflict. Eve of the Battle According to the Polish mobilization scheme, the main task of the Łódź Army was to secure the connection between the Kraków Army operating in Silesia and Lesser Poland and the Poznań Army defending Greater Poland. It was also to cover the mobilization of a reserve Prusy Army behind the Polish lines. Because of that, the main purpose of the army was to gain time and offer delaying actions and harsh resistance in order for the mobilization to be accomplished. The Wołyńska Cavalry Brigade was located north of the town of Kłobuck, along the railway to Katowice. Two regiments (19th Volhynian Uhlan Regiment and 21st Vistula Uhlan Regiment, as well as 4th battalion of the 84th Infantry Regiment) were entrenched on both ends of a forest surrounding the village of Mokra, to the west of the north-south rail road line. To the east, Colonel Julian Filipowicz placed the reserves of the brigade: 12th Podolian Uhlan Regiment, 2nd Mounted Rifles Regiment and 21st Armoured Battalion. The main task of the Polish brigade was to keep the connection between the 7th Infantry Division (Poland) operating to the south and the 30th Infantry Division (Poland) to the north. The terrain chosen by the Polish commander was ideal for defence: a railroad earthwork and a forest formed the main defensive line while the foreground was hilly, with a large number of ditches, streams and other obstacles. Battle On 1 September at 0500, the German Tenth Army of Army Group South crossed the Polish border and initiated the invasion of Poland. The German 31st Infantry Division, as well as 1st and 4th Panzer Divisions crossed the border in the operational sector of the Polish Volhynian cavalry brigade. After breaking through small Border Guard and National Defence detachments, the German units seized the towns of Krzepice and Starokrzepice, directly in front of the main Polish positions. After capturing them, the Germans razed both towns and expelled all the local inhabitants towards the Polish lines. The German units were divided into