This paper compares two attempts by the author to teach two different grade 12 world history classes to think historically. Both classes were presented with a similar assignment that revolved around the conflicting historical accounts of Christopher Columbus. However, the second group of students was also provided with direct instruction about the nature and construction of historical accounts. In the end, this second group of students demonstrated, on average, a more sophisticated understanding of the study of history. These results correspond with a growing body of research, which suggests that historical understanding can be taught by carefully crafted lessons.