The servants of Achish said to him, "Isn't this David the king of the land? Didn't they sing one to another about him in dances, saying, 'Saul has slain his thousands, David his ten thousands?'"
So David's saying, "I'm a CIA agent, I'm on a special mission for the king, and nobody knows about this special mission. It's just a secret mission that I'm on for King Saul. So my men are over here, and I need some bread for them.