hi! more info is welcome; meanwhile get started on these previous discussions

general

• Vatican City during WWII; What, if any, influence did they have. Did they remain strictly neutral?

• Given Hitler's perceived Catholicism and Pope Pius XII's neutrality, how widespread was anti-Catholic sentiment during World War II?

• What's the truth behind the Nazi era pope/church?

• Role of the Vatican in World War II

... on the holocaust

• Where was the church during the holocaust?

• How did the Roman Catholic Church react to the Holocaust?

An earlier post of mine addresses the Vatican during WWII and you may find it interesting, though it largely focuses on the later controversy surrounding the pontiff during WWII--Pius XII.

The Vatican undertook large scale relief efforts during WWI and were nicknamed the Second Red Cross by some during that period. These efforts focused on refugees, POW camps, and communication between various parties during the war. There were also efforts to provide chaplains to the various combatants and to support those chaplains.

During WWII, the Vatican was obligated by the Lateran Accords to practice strict neutrality in foreign affairs. Article 24 is the relevant portion of the treaty, and it reads:

In regard to the sovereignty appertaining to it also in international matters, the Holy See declares that it desires to take, and shall take, no part in any temporal rivalries between other States, nor in any international congresses called to settle such matters, save and except in the event of such parties making a mutual appeal to the pacific mission of the Holy See, the latter reserving in any event the right of exercising its moral and spiritual power.

The Vatican City shall, therefore, be invariably and in every event considered as neutral and inviolable territory.

The treaty was signed in 1929 and created the Vatican City as a nation. Between 1929 and 1871, the status of the Vatican was up in the air. Italy had unified, but had not taken the Vatican itself. The Lateran Accords solved what was called the "Roman Question."

The territory of the Vatican was hit twice by bombs during WWII--once each by the Axis and by the Allies. Damage was slight, and there were no casualties on either occasion. Pius XII tried to get President Roosevelt to forswear bombing Italian cities to absolutely no effect. There were small scale back channel talks between Axis and Allied parties via the Vatican, but these too were ineffectual. Vatican attempts to mitigate the horrors of either conflict were not as effective as they would have liked.

Followup questions by OP and others are always encouraged.