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.

Kłobuck is a town in southern Poland, with 12,934 inhabitants (2019). Located in the Silesian Voivodeship, about 15 km northwest of Częstochowa, it is the capital of Kłobuck County. Historically, Kłobuck belongs to Lesser Poland, and is located in its extreme northwestern corner, near the border with two other Polish historical provinces – Greater Poland, and Silesia. The town lies among the hills of Lesser Poland Upland. Most of Kłobuck lies 240 to 260 metres above sea level, and the highest point within town's limits is Dębowa Góra. Kłobuck has the area of 47 km2, with forests taking up 20%.