This study investigates the dramatic global cooling during the Late Ordovician, 440 million years ago. Our simulations reveal a powerful feedback loop: as the ice sheet grew, it generated strong, cold winds flowing down its slopes. These winds further cooled the continents, causing the ice sheet to expand even more. The super ice sheet led to a substantial global temperature drop of about 1.5 °C. Interestingly, while continents froze, the oceans warmed.