This might have forced them to surrender or to move out of the city in an attempt to re-establish their supply lines .
In theory , this would have eliminated the ability of the German garrison to operate as a fighting force by cutting off their supply lines .
This might have forced German to surrender or to move out of the city in an attempt to re-establish German supply lines   lines .
In theory , this would have eliminated the ability of the German garrison to operate as a fighting force by cutting off their supply lines .