An interesting photo as the Vomag Omnibus 7 was a civilian transport vehicle. There isn't a lot of information available about the Omnibus 7. The variant is known as the Vomag 88mm Flak 18 Waffentrager. It is an example of the need to get such an excellent but horribly immobile weapon into battle and as maneuverable as possible.
The Battle of Monte Cassino was a series of four costly assaults by the Allies in the Italian campaign. The defending German forces held the Winter Line series of three defensive lines across Italy, centered around the town of Monte Cassino - Highway 6 ran through here all the way to Rome. The plan was to break through and drive onto Rome, it took 123 days, 55,000 casualties to finally dislodge the German defenders.
Nebelwerfer - "Smoke Mortar" The Nebelwerfer was originally developed as a method of delivering poison gas and smoke shells, it was developed for the "Nebeltruppen" or smoke troops, this was all part of a disinformation strategy to fool the League of Nations. In combat it was given the nickname by the allies of "Moaning Minnie" or "Screaming Mimi", one of it's main disadvantages was the huge plumes of smoke left behind pinpointing the firing location, once fired the crew must relocate almost immediately to avoid devastating counter artillery fire. https://en.wikipedia.org/wiki/Nebelwerfer#Comparable_systems