This refusal having led to an altercation between him and Bothwell, Murray, true to his system of neutrality, withdrew into his earldom, and let affairs follow without him the fatal decline they had taken.
In the meantime the Confederates, after having failed at Borthwick, not feeling strong enough to attack Bothwell at Dunbar, marched upon Edinburgh, where they had an understanding with a man of whom Bothwell thought himself sure.

This man was James Balfour, governor of the citadel, the same who had presided over the preparation of the mine which had blown up Darnley, and whom Bothwell had, met on entering the garden at Kirk of Field.

Not only did Balfour deliver Edinburgh Castle into the hands of the Confederates, but he also gave them a little silver coffer of which the cipher, an "F" crowned, showed that it had belonged to Francis II; and in fact it was a gift from her first husband, which the queen had presented to Bothwell.

Balfour stated that this coffer contained precious papers, which in the present circumstances might be of great use to Mary's enemies.

The Confederate lords opened it, and found inside the three genuine or spurious letters that we have quoted, the marriage contract of Mary and Bothwell, and twelve poems in the queen's handwriting.