during the invasion of poland, xix army corps was part of 4th army, which was itself subordinate to fedor von bock's army group north. 4th army's task was to take poland's north-western danzig corridor from pomerania and to then unite with 3rd army in east prussia, commanded by georg von küchler. inside 4th army's overall military strategy, xix army corps was to strike southwards towards the vistula river and deny polish troops to the west of it the retreat eastwards. xix army corps had by then been expanded since its inception in july and now consisted of 3rd panzer division, 2nd infantry division and 20th infantry division.