What forced Charles I to summon a new parliament,after he had ruled without one for eleven years?

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An invasion force from Scotland, known as the Bishops' Wars, forced Charles I to summon a new parliament in 1640. The conflict had drained the King's finances, and he was unable to finance a prolonged war without the support of parliament. This parliament, known as the Short Parliament, was dissolved after just three weeks, but a second parliament, known as the Long Parliament, was called later that year and lasted until 1660.

What Forced Charles I to Summon a New Parliament,after He