When did scotland defeat england and gain independence?

Scotland was never part of England, although it was dominated by England towards the end of the 13th Century. Complete independence was achieved after the Battle of Bannockburn in 1314 under Robert The Bruce, although this was not formally acknowledged till 1328.

The English and Scottish crowns were united in 1603 under James VI (James I of England), but they remained separate kingdoms till the Act of Union in 1707.