Is there any special act of this virtue in which all its excellence is shown forth?
Yes, it is martyrdom (CXXIV.).
What is martyrdom?
It is that act of the virtue of fortitude which sustains man in accepting death in testimony of the truth from the hands of those who persecute the name of Christian and all that pertains thereto (CXXIV. 1-5).
Next - The Catechism of the Summa - XLII. OF THE VIRTUE OF FORTITUDE AND ITS ACT; OF MARTYRDOM; OF THE SINS OPPOSED THERETO: OF FEAR; OF INSENSIBILITY TO FEAR; OF RASHNESS (C)