CRIMEA

The peace with Germany was tense, as both sides were preparing for the military conflict,and abruptly ended when the Axis forces led by Germany swept across the Soviet border on 22 June 1941.

During the Second World War there was fierce fighting between German-Romanian troops and the Red Army. Sevastopol was the last stronghold where the Soviet Union held out. The city was besieged for 8 months before it fell into German hands. In the spring of 1944 the Germans had to cross the withdraw the entire line. The Red Army attacked Perekop - the isthmus connecting Crimea to the mainland - in the north and a German retreat was cut off. The last German troops in Crimea withdrew to Sevastopol, but on May 12, 1944 the last German troops surrendered.
Here is a letter that was sent by field post just before.

The sender is indicated on the back: field post number 22217. The letter is still in the envelope, but the writing makes it difficult to read.
You can do some research on the internet: the series of field post numbers can be found at https://axishistory.com/feldpost-nr/:
22217
(Mobilmachung-1.1.1940) Verpflegungsamt 173
(24.8.1943-5.4.1944) 4.2.1944 Verwaltungs-Kompanie 173.
This unit belonged to the 73rd Division and is also mentioned in this division at http://www.lexikon-der-wehrmacht.de/Gliederungen/Divisionseinheiten/IDEinheiten73.htm The battles of this division are also described: in March 1944 the division defended the Kertsch peninsula (in Crimea) and took on the heavy “Rückzugskämpfen auf der Krim bis Sewastopol teil.” The division was destroyed here on May 8, 1944.
In my collection I still have a few letters from the same correspondence and the soldier who wrote the letter then broke down. He wrote another letter in May 1944. The unit in question is then in Romania.
In March 1944, the Soviet Union issued a series about the liberation of a number of cities, including Sevastopol.

Mi. 896, issued march 1944.