Yitzhak Sadeh, (1890-1952 also known as Isaac Landoberg), was the commander of the Palmach and one of the founders of the Israel Defense Forces at the time of the independence of the State of Israel. Born in Lublin in 1890, he was honored with a medal from the Russian army for his bravery during World War I. During 1917-1919 he assisted Joseph Trumpeldor in the foundation of "HeHalutz" ("The Pioneer") movement and in 1920 made "aliya" to the land of Israel. Wikipedia
The definitive Wikipedia entry for Yitzhak Sadeh. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Yitzhak_Sadeh
