Italy Volume I: The Sangro to Cassino
Maximum support of the attack in street fighting was shown to be very difficult because of the closeness of our own troops. The defensive artillery fire of the enemy in Cassino was more effective.page 360
The identification of targets was facilitated by the issue to Forward Observation Officers of marked photographs, showing numbered buildings and groups of houses.
Our artillery would have been well advised to make a more systematic effort to close Route 6 on the enemy side of Cassino by harassing fire. (General Senger's comment.)
The use of air OPs in counter-battery work was an outstanding success.
For the use of artillery in producing smoke see below, Section (f).