The weapon illustrated below appears to be an example of the French Canon de 75mle 1897, sometimes known simply as the "French '75". This weapon was excellent for its time and became a benchmark for similar canon, especially after having gained the reputation as the gun that won the First World War for France. Well over 10,000, perhaps as many as 17,000, were produced, and the French exported them to other armies around the globe. The Germans captured them in great numbers and found them especially useful in combating Soviet T-34 and KV-1 tanks at a time when the only other German weapon capable of dispatching such vehicles was the 88mm flak gun.
The vehicle portrayed here is the French Char B 1, a tank impervious to any German weapon save the 88 mm anti-aircraft gun.
The vehicles illustrated below appear to be examples of the sIG 33 auf Geschuetzwagen, an improvised infantry-support artillery piece that proved to be quite successful in the invasion of France.