Postes had been widely used in most of Europe from the late 1800's, and the advancing Magyar soldiers of the Second Army had been well introduced to it back in Hungary by the Horthy regime.  But the profuseness of Soviet propaganda and the high quality of it must have been a novelty -- besides the Cyrillic alphabet.

Hungarian Soldiers with Soviet Posters, 1942

In the noise, danger, and uncertainty of the war, letters sent  by wives, mothers, daughters, and sweethearts were very much appreciated by the often lonely and despondent men at the front. As in the case of these Honveds resting behind the front lines, both reading and writing personal letters was was an important aspect of maintaining their emotional balance.

Letters from Hungary, Don Army, 1942

A unit of Hungarian machine gunners shown here manning a position by the Don. Magyar field artillery was effective here, but anti-tank guns were mainly small caliber and scarce,  tanks were hardly present in any number, and self-propelled artillery was not yet available. But they had good Mosin Nagant rifles.