Deir Yassin was once a peaceful Palestinian village on the west side of Jerusalem. On April 9, 1948 the lives of over 100 innocent men, women, and children ended by the hand of Jewish terrorists from the Irgun and the Stern Gang.
Deir Yassin is 1,400 meters to the north of Yad Vashem, the most famous Holocaust memorial, where the world is taught to “Never Forget.”
Might the world also remember that on May 15, 1948, the British left Palestine and the Israeli military force consisted of three independent groups: "The larger one was the Hagana. Within the Hagana there was a strike force known as the Palmah. Outside Hagana there were two more independent smaller forces. The bigger of the two was Etzel, which was the underground terrorist organization of the opposition party led by Menahem Begin, and the smaller one was Lehi, known also as the Stern Gang, a splinter group which separated from the Etzel a few years previously." 
"The Deir Yassin incident was part of the Middle East war of 1948, variously referred to as the Israeli War of Independence, the First Arab-Israeli War, or the First Palestine War. The conflict arose out of decades-old competing claims of nationalist Jews and Arabs for sovereignty over Palestine (today Israel, Jerusalem, the West Bank, and Gaza Strip). European Jewish nationalists, organized as Zionists in 1897, sought to establish a Jewish state through colonization of Palestine, while Arab nationalists sought an Arab state for Palestine's Arab majority. 
There are many versions of what happened in Deir Yassin on April 9, 1948. One report by then Colonel Dr. Me'ir Pa'ill, [who later represented the Meretz Party in the Knesset] a liaison officer representing the Palmah in the headquarters of the Hagana in Jerusalem gave an interview in the magazine Monitin, April 1981, Edition 32, page 36:
"Etzel and Lehi had decided to carry out one operation together. They counted their men and discovered that together they could supply 130 fighters. Among the Etzel members there was one, Joshua Goldshmid, who lived in Giv'at Shaul, a western suburb of Jerusalem close to Deir Yassin and he was the one that pushed for Deir Yassin. The place itself was a small village of 750 inhabitants. It did not have a strategic location and wasn't situated on any important road....Since the Hagana was holding the lines of communications, Etzel and Lehi asked David Sha'altiel, the commander of the Hagana's Jerusalem district for a meeting. I'm telling you this to show that I knew what was going on, because I was in the picture from the beginning. Sha'altiel told them that the plan of the Hagana was, that when the British army leave (shortly), they would take over Deir Yassin and level it to build an airport… 
"It was Friday, the 9th of April 1948 and I went in together with them. I had a tommy-gun with a disc magazine, 50 bullets and proper boots. On that day I did not fire even one bullet. With me was a guy with a good Leica camera capable of taking 36 still, black and white pictures. Half of them were shot during the battle and half afterwards...The raid was supposed to start two hours before dawn. The road to Deir Yassin was open. It was not mined or obstructed because it was constantly in use. The plan was that the van carrying the Etzel/Lehi members would drive on this dusty road and a loudspeaker would call to the inhabitants to flee from the village. I was walking on this very road. They (Lehi) didn't know who I was. They were late and reached the village when it was already daylight…I thought that now a small skirmish would develop, but there was actually a battle. From my battleground experience I noticed that the Arabs had only rifles. All their shots were single shots. Only the attackers had automatic weapons...Suddenly; at about 11 o'clock in the morning, I heard the explosions of 2 inch mortar shells. I looked out of the window and I saw ten Palmah fighters under the command of the late Jacob Wog, descending and taking over the rest of the village…They (Etzel & Lehi), were not able to carry out even their own task. We had to send in a tired platoon to finish the job for them. Suddenly I started to hear shooting from all directions in the village. I ran there with my photographer and I saw gangs of Etzel and Lehi running through the alleys. In my report I added: 'with bulging eyes' as if they were 'running amok'. They were running from house to house. They got inside, and butchered whoever was there by shooting, not by hand grenades! By shooting! I called it hot blooded murder. It was spontaneous, not planned. I ran after them shouting:' what are you doing?' They looked at me as if I was crazy, also with those bulging eyes. The photographer was taking pictures of scenes that I can still see, even now, with my own eyes: A corner in a room. A woman, children and an old man, butchered.