Scott Clark explains the problem and how it was addressed:
Read it all at the Ligonier site here
Everyone knows the acronym TULIP, but not everyone knows where this acronym comes from. The Canons of Dordt are among the most famous but unread deliverances of any Reformed Synod. The canons are more than five letters. The canons teach a pastoral doctrine of grace and provide a model for the stewardship of the Gospel.The Canons (rules) of the Synod of Dordt were written after years of controversy within the Reformed churches in Europe and Britain. In the late sixteenth century the Reformed doctrines of sin, grace, faith, justification, atonement, perseverance, and assurance faced a growing resistance.
[NB: The Canons of Dordt are not to be placed in the same category as The Guns of Navarone]