Is there any historical evidence to prove when elephants were first used in battle?

mementoflash

The Asian elephant was used in battle as early as 1100 B.C., but it was not until 326 B.C., at the Battle of Hydaspes, that the first European commander encountered elephants in battle. Alexander the Great defeated an army commanded by Poros at Hydaspes, in modern Pundjab, and of the 200 Indian war elephants deployed there Alexander captured 80 animals which he later incorporated into his own army. In the course of his campaigns, Alexander was able to gather as many as 200 elephants in his army. King Pyrrhus of Epirus defeated the Romans at the battle of Heraclea (280 B.C.), on the Gulf of Tarent, primarly because of the 26 Indian elephants in his command. http://miniatures.de/html/esp/kriegselefanten.html Feb 17 06, 7:16 AM