Yud Bais Tammus is the Yom Huledes of the Frierdiker Rebbe, in 5640.

On this day, in 5687, he received the good tidings that he was freed from the exile imposed upon him after his arrest and imprisonment for his efforts in strengthening Torah and Judaism.

From a letter of the Frierdiker Rebbe:  "During the forthcoming two Days of Liberation 12 and 13 Tamuz, Chassidim are to farbreng, for material and spiritual good and blessing, as instituted by our first father, the Alter Rebbe (may the memory of this holy tzadik be a blessing for life in the Hereafter; his soul rests in the hidden exalted heights; may his merit protect us). During this farbrengen Chassidim are to talk to one another in a spirit of brotherhood about strengthening fixed times for Torah study. I send them my blessing that G-d favor them in body and spirit.

The Geulah of Yud-Beis Yud-Gimmel Tammuz is commemorated on two days, the 12th and 13th day of Tammuz. The reason for this is because on the 12th of Tammuz the Previous Rebbe was merely notified of the Geulah, however he was not freed from exile, because that day was a national holiday and all government agencies were officially closed.

It was only on the next day, the 13th of Tammuz, that the Rebbe was actually released. All matters are, of course, by Divine Providence, particularly things concerning the Nassi HaDor.

Why then, did Hashem make it in such a way that the actual liberation should be delayed for another day, until the 13th of Tammuz?! A similar question arises regarding the liberation of the Alter Rebbe on Yud-Tes Kislev, about which he writes (Igros Kodesh Admur HaZoken #38-39), in his letters to HaRav Levi Yitzchok Berditchever and HaRav Boruch of Mezibuzh, that in his redemption “Hashem made great wonders in the world . . especially in the eyes of the ministers and the eyes of the nations in the kings land.” Here too, the question is: The Geulah of Yud-Tes Kislev is a very sublime matter, Yud-Tes Kislev is “Rosh HaShana of Chassidus,” and on Yud-Tes Kislev began the main thrust of “Hafotzas HaMa’ayonos chutza” (spreading the fountains of Chassidus to the outside), why then place such emphasis on the impression it made on the “nations of the world?”

The explanation is: Being that these two Geulah’s, are related to the true and complete Geula, when the entire world will be refined and elevated, including the nations of the world, as the possuk says “I will then transform the nations of the world to serve the one G-d in unity”, that is why mention is made of the influence these Geulah’s had on the entire world, as the Alter Rebbe wrote that his Geula was “before the eyes of the ministers and the nations”, and the Previous Rebbe’s release was publicized and conformed with the decrees of the land, it was delayed to conform with an official national holiday.

 There is an even more profound affect that Yud-Beis Tammuz has on the nations of the world: In the war between Russia and France (1813) the Alter Rebbe was strongly opposed to Napoleon Bonaparte, and he wanted a victory for Russia. Because the spiritual welfare of the Jewish people will be more favorable under Russian rule than under French rule.

As we actually see, that all the generations from the Baal Shem Tov until the first years of the Previous Rebbe’s nesius – the revelation and spreading of Chassidus was particularly from Russia. The avodah (Divine service) of elevating and refining France was initiated by the Previous Rebbe, to the extent that he visited France and sent his emissaries there, members of his family [the Rebbe and Rebbetzin lived there from 1933 to 1941], where he kindled “luminaries” to light up the environment by spreading the fountains of Chasidus, and influencing also the non-Jews to fulfill their “Seven Universal Laws.”

It’s clear that the 12th & 13th of Tammuz emphasizes it’s affect on all the nations of the world even the lowliest. This should therefore accentuate for us, to strengthen our faith in the coming of Moshiach, and to await and anticipate his arrival, as the Rambam writes (Hilchos Melochim beg. of ch.11) that “belief” in Moshiach is not sufficient, but there also has to be “anticipation of his coming.” This includes learning about Geulah and Moshiach, which itself hastens the Geulah. And the farbrengen of Yud-Beis Yud-Gimmel Tammuz and of the following days, will be continued with the Rebbe, a soul within a body, together with Moshiach in our Holy land, in Yerushalayim the holy city, in the Beis HaMikdash.

(Sefer HaSichos 5749 p. 568)