Invasion of the Fire Nation

''This article is about the battle. You may be looking for the episode of the same name.''

History
In the summer of 1001, Team Avatar traveled to Wan Shi Tong's Library in order to find information about the Fire Nation and possibly find an end to the war. It was there where Sokka discovered the piece of scorched parchment labeled "The Darkest Day in Fire Nation History". Curious, Sokka wanted to know what happened on the Darkest Day. Fortunately for him, he was led to a celestial calendar by one of Wan Shi Tong's animal servants. This calendar had the ability to place accurate models of the sun and the moon's position in relation to the earth. By entering the date found on the parchment, Sokka was able to find that on the Darkest Day, a solar eclipse had occurred, causing firebenders to lose their bending ability.