Indeed Knox's spirit is so unworthy that for this, among other reasons, Archbishop Spottiswoode declined to believe in his authorship of the "History." The actual facts were not those recorded by Knox.
As regards the "Appointment" or arrangement of the Scottish Government with the Castilians, it was not made late in January 1547, but was at least begun by December 17-19, 1546.

{25a} On January 11, 1547, a spy of England, Stewart of Cardonald, reports that the garrison have given pledges and await their absolution from Rome.

{25b} With regard to Knox's other statements in this place, it was not _after_ this truce, first, but before it, on November 26, that Arran invited French assistance, if England would not include Scotland in a treaty of peace with France.

An English invasion was expected in February 1547, and Arran's object in the "Appointment" with the garrison was to prevent the English from becoming possessed of the Castle of St.Andrews.

Far from desiring a papal pardon--a mere pretext to gain time for English relief--the garrison actually asked Henry VIII.