why allies failed at beating turks

Watching the movie i saw one mistake that i thought was a big player in the reasons of losing. The plan was to drop bombs on enemy trenches and then rush them before they could get back to th trenches. they waited too long and the turks flooded back into the trenches with guns loaded before they ran. bottom line: they waited too long. Also they didn't even ordered to load their guns when rushing the trenches. They were instructed to unload their firearms. This was a terrible idea because they couldn't even shoot in an attempt to take someone down before they died.