Given below were the causes of defeat Siraj-ud-daulah in the Battle of Plassey :
1. Conspiracy of Clive: Clive gave a hitting blow to Siraj-ud-daulah by hatching a conspiracy against him. He won over the support of Mir Jafar, the army commander of Siraj-ud-daulah, and easily defeated Siraj-ud-daulah.
2. Lack of farsightedness of Siraj-ud-daulah: Siraj -ud-daulah was not a farsighted ruler. Had he been a wise ruler, he would have kept an eye on the activities of the English and his other opponents. He would have noticed the conspiracy beforehand which was being hatched by Clive. So, lack of his farsightedness became a cause of his defeat.
3. Lack of Military resources: The military set up of Siraj-ud-daulah was faulty. His soldiers were neither trained like the English soldiers nor they had modern weapons of war. Soldiers of the Nawab fought like a crowd in the battle. They lacked discipline.
