<human>:  How many people died in the battle of the Somme?
<bot>: The Battle of the Somme lasted for 141 days and resulted in a total of 1,779,802 casualties. The Battle of the Somme was the longest battle in British military history, and it was the bloodiest battle in the history of the British Army. The Somme was the first major battle in World War I and the first battle in which poison gas was used. The battle was fought between July 1 and November 18, 1916. The Battle of the Somme was one of the first battles in which tanks were used.