It was a good advise to search myself.
In the MILITARIA ( no 1(10)2009) there was an article by Mr Miroslaw Wawrzynski " Obrona przeciwlotnicza Modlina we wrześniu 1939 roku" ( Air defence of Modlin in September 1939).
It says:...on 5 September in the afternoon again over the fortress (Modlin) arrived Dorniers Do 17Z from Staffel 6 KG3. One of the attacking airplanes managed to hit with a little bomb (called a mouse) hit an ammo box of the Bofors 40mm antiaircraft gun. Detonating shels wounded 5 soldiers - 3 among them died.
And the second notice:
On 10 September the Germans arrived over the Vistula River bridge (airride from 9.32-11.35 am). There were Dorniers Do17Z from 4/KG3. Strong defence prevented them from successful attack.
So some questions for specialists:
1. What kind of little bombs (mice) could Luftwaffe use?
2. How many staffels had KG3 and how many aircrafts they had?
The taken in Elbing ( Elblag) shows Do17 probably from KG3
zdrowko