What did the early church believe about the "rapture"?

There are a lot of differing opinions on when the rapture will take place (pre-tribulation, post-tribulation, or mid-tribulation). From my own attempts to research the topic and look at Scripture from outside my presuppositions, I have found good arguments for all sides of the issue. What did the early church actually believe about the "rapture"? Note: This question is (obviously) not a duplicate of the question "What view of eschatology did the early church believe? " — I wrote that question and, seeing that I needed to be more specific about the different aspects of eschatology, I wrote this question that specifically dealt with the "rapture." The other question, by contrast, mentions nothing about the "rapture" in any of the answers.