Its genesis is actually quite interesting: Due to the de-militarized status of the Free City of Danzig, the SS-HWD was raised in secret. Thus, the SS men from outside Danzig came as "tourists" or as participants in an SS sports competition that was actually organized just for that purpose, while the Heimwehr's "imported" trucks and other vehicles were given civilian paint jobs before being smuggled into Danzig.
1,500 men strong, the unit made its first public appearance on 18 Aug. 1939, being presented with its colors on the occasion.
When WW2 broke out on 1 Sept. 1939, it was amongst the first German units to see action, participating in the fighting for the Danzig post office. The Heimwehr was also involved in other actions in the Danzig area. (such as at Gdingen and the Oxhöfter Kämpe)
Following a final victory parade on 29 Sept. 1939, it was transferred to Dachau and disbanded; its sub-units being integrated into the new SS-Totenkopf-Division, (the great majority going to SS-Totenkopf-Infanterie-Regiment 3).
The locally recruited young Danzigers were actually given the option to leave the SS; some three or four men used this chance and left.