The Germans used heavy and lighter mortars, artillery of all calibres, including 88mm armoured S.P.'s, which were on the job, firing in a straight line through the houses, demoralising and keeping everyone constantly on their toes.
The enemy's fire was perfect but we never once moved from our positions.
The distance between the front lines was very close in some places, as much as 200 yards and the orders given - even the march of individual soldiers - could be heard perfectly.
The clatter of boots on a street a dozen yards from the front line immediately drew fire from mortars or S.P. (self-propelled) guns. Our men moved without a murmur or a word, either by day and by night. The worst moment was when the unit was relieved, when the heavy weapons had to be taken out of their positions and relief platoons were brought in to replace them.

Kazimierz Duda - Chronicles of war - 5 to 27 October 1944 - Page 89