FYI July 20, 2020

On This Day

1592 – During the first Japanese invasion of Korea, Japanese forces led by Toyotomi Hideyoshi captured Pyongyang, although they were ultimately unable to hold it.
The Japanese invasions of Korea of 1592-1598 or Imjin War comprised two separate yet linked invasions: an initial invasion in 1592 (Imjin Disturbance), a brief truce in 1596, and a second invasion in 1597 (Chongyu War). The conflict ended in 1598 with the withdrawal of the Japanese forces[1][20] from the Korean Peninsula after a military stalemate[21] in Korea’s southern coastal provinces.[22] It ultimately resulted in Joseon Korean and Ming Chinese victory and the expulsion of Japan from the peninsula.

The invasions were launched by Toyotomi Hideyoshi with the intent of conquering the Korean Peninsula and China, which were respectively ruled by the Joseon and Ming dynasty. Japan quickly succeeded in occupying large portions of the Korean Peninsula, but the contribution of reinforcements by the Ming,[23][24][25] as well as the disruption of Japanese supply fleets along the western and southern coasts by the Joseon Navy[26][27][28][29] forced a withdrawal of Japanese forces from Pyongyang and the northern provinces to the south in Busan and nearby regions. Afterwards, with righteous armies (Joseon civilian militias)[30] launching guerrilla warfare against the Japanese and supply difficulties hampering both sides, neither were able to mount a successful offensive or gain any additional territory, resulting in a military stalemate. The first phase of the invasion lasted from 1592 until 1596, and was followed by ultimately unsuccessful peace negotiations between Japan and the Ming between 1596 and 1597.

In 1597, Japan renewed its offensive by invading Korea a second time. The pattern of the second invasion largely mirrored that of the first. The Japanese had initial successes on land, capturing several cities and fortresses, only to be halted and forced to withdraw to the southern coastal regions of the peninsula. However, the pursuing Ming and Joseon forces were unable to dislodge the Japanese from their remaining fortresses and entrenched positions in the southern coastal areas,[31][32][33] where both sides again became locked in a ten-month long military stalemate.

With Hideyoshi’s death in 1598, limited progress on land, and continued disruption of supply lines by the Joseon navy, the Japanese forces in Korea were ordered to withdraw back to Japan by the new governing Council of Five Elders. Final peace negotiations between the parties followed afterwards and continued for several years, ultimately resulting in the normalization of relations.[34]



Born On This Day

1882 – Olga Hahn-Neurath, Austrian mathematician and philosopher (d. 1937)
Olga Hahn-Neurath (German: [haːn ˈnɔʏʀaːt]; Hebrew: אולגה האן-נוירת‎; July 20, 1882 – July 20, 1937) was an Austrian mathematician and philosopher. She is best known for being a member of the Vienna Circle. She was sister of the mathematician Hans Hahn.


Born in Vienna, Hahn enrolled as a student for math and philosophy studies at the University of Vienna in 1902.[1] She became blind in 1904, when she was 22. In 1911, she became the third ever female graduate in philosophy at Vienna University.[1] Her doctoral thesis, published at 1911, received great compliments from her instructor, Adolf Stöhr, the successor to the chair of Ludwig Boltzmann. Her main interest in math was in the field of Boolean algebra.

In 1912 she married Otto Neurath whom she met during her studies. Olga became a regular participant in the Vienna Circle discussions. Following the defeat of Red Vienna in the Austrian Civil War (February 1934), she fled, through Poland and Denmark to the Netherlands, where she joined her husband. She died on her birthday three years later in The Hague, following an operation.



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