He was the first Polish general to die in the invasion, and the second general officer casualty of the campaign overall; the first was Wilhelm Fritz von Roettig.
Józef Piłsudski | Józef Ignacy Kraszewski | Józef Simmler | Józef Poniatowski | Jozef Gabčík | Józef Michalik | Józef Andrzej Załuski | Józef Dominik | University of Pavol Jozef Šafárik | Józef Wybicki | Jozef Štafura | Józef Razowski | Józef Maria Hoene-Wroński | Józef Mackiewicz | Józef Kustroń | Jozef Israëls | Józef Dwernicki | Jozef Cleber | Józef Brudziński | Jozef Brudzinski | Józef Bem | Józef Zajączek | Józef Wojciechowski | Jozef Tomko | Józef Sowiński | Józef Potocki | Józef Pietrończyk | Józef Peszka | Józef Olszyna-Wilczyński | Jozef Murgaš |
These plans, however, were quickly changed, after the Germans destroyed key Polish unit, 21st Mountain Division near the village of Dzikowiec, on September 15/16, killing general Józef Kustroń.
After the incident, Generalmajor Eugen Ott, commander of the 7th Infantry Division, which was then concentrated in the area of Žilina, apologised to General Józef Kustroń, commander of the 21st Mountain Infantry Division, which was stationed in nearby cities, and which was responsible for protection of the border.