Led to EIC getting power to rule India (actually began ruling later in 1772). Qasim shifted from Murshidabad to Bihar to be physically away from Brit and act independently. EIC after Battle of Plassey 1757 began dominating even domestic trade but Qasim ended all internal duties.
EIC did not like this autonomous behaviour so defeated Qasim and replaced with Mir Jafar.
Why Shuja defeated?
- Tactical mistake: Shuja deployed offensive strategy rather than defensive of cutting EIC army supplies
- He ignored advice of Qasim
- EIC treated Shah Alam II 6006 with respect as in him lay sovereignty of India and with him at their side, EIC could have greater influence