Infantry in trenches at Don's Bend, October 1942.
Photo source: http://www.worldwar2.ro/foto/?id=171&area=31

Infantry at Don's Bend

Serbian Volunteer Corps

Romanian built 75mm DT-UDR 26 (Reșița) antitank gun model 1943. 
By the end of 1944 some 342 have been produced.

Specifications
Calibre____________________75mm
Overall length______________5.45m
Width ____________________1.82m
Height____________________1.55m
Barrel length_______________3635mm
Rifling length ______________2501mm
Vertical field of fire__________-7° to +35°
Horizontal field of fire________70°
Weight in action____________1430kg
Shell weight (AP)___________6.6kg
Muzzle velocity_____________1030m/s
Armour penetration_________100mm at 1000m
Max range ________________12000m
Crew_____________________7

Info and photo source: http://www.worldwar2.ro/arme/?article=300