Here is my modest translation of Polish article about battle of Zembowitz:
During the 3rd Uprising, on the 6th of May 1921 Zembowitz was occupied by Polish insurgents.
Through the whole period of uprising fiercely fights for the town took place, especially for local train station which was an important point of defense for Polish forces.
On the 21st of May german battalions Guttentag (Schnepper) and Lublinitz (Genz) attacked Zembowitz, defended by sturm company of Lt. Andrzej Kmicic, 1st company of Lublinitz Btl. of Karol Lubos( Subgroup Butrim) and recently arrived armored train Nowak (Lt. J.Horst).
First German assault was repelled, as well as the next one on 22.05. The attack of Btl. Guttentag was collapsed by Polish Btl. of Lt. Drabski from Subgroup Linke and two armored trains--Zygmunt Powstaniec and previously mentioned Nowak.
On the 5th of June, after few days of heavy fights Germans finally got a chance to hold out in the town with a few companies of Btl. Guttentag and Btl. Kuenzel (having Btl of Karel Brandys opposing them on Polish side), but this attack failed later as well as two more on the 8th of June.
Only the final assault on the 11th of June lead SSOS forces ( Btl. Guttentag and 4 companies of Btl. Hindenburg) to success, allowing them to enter the town.
But soon enough, as a result of counterattack from direction of Szemrowice and Kadlub Wolny lead by two Battalions of Subgroup Linke and supported by artillery (Lt. Westfalewicz) the town again was kept in hands of Polish insugents. The price was high--Polish forces lost 48 ppl in battle KIA, another 50 were heavily wounded.