They attacked with no ammo?!?!

During the battle of Gallipoli, the Allies made several mistakes when they were trying to defeat the Turks. One of the biggest, and uncomprhensible, tactic the Allies used was to run out of their trenches, in a certain time sequence, and head straight to the Turkish trench without any ammo. Now, once I saw this happening in the clip of "Gallipoli" that we watched in class I was flabberghasted to see that the Allies actually did this. First of all, because the Allies made all of their attacks on certain minutes and seconds, this gave the Turks the exact time that they should be ready to shoot at the troops running at them. Another shocking tactic the Allies used was to run to the Turk trenches with an unloaded rifle. And throw in the fact that the Turks had machine guns set up to shoot anyone that ran across. All of these strange techniques really brings up the questions of why did the Allies think that this plan was going to work? And how did they think that men would actually make to the other side using this tactic?