Library Eusebius of Caesarea Life of Constantine
Book 2
Chapter 33: Concerning those Confessors engaged in Military Service
Once more, with respect to those who had previously been preferred to any military distinction, of which they were afterwards deprived, for the cruel and unjust reason that they chose rather to acknowledge their allegiance to God than to retain the rank they held; we leave them perfect liberty of choice, either to occupy their former stations, should they be content again to engage in military service, or after an honorable discharge, to live in undisturbed tranquillity. For it is fair and consistent that men who have displayed such magnanimity and fortitude in meeting the perils to which they have been exposed, should be allowed the choice either of enjoying peaceful leisure, or resuming their former rank.
English translation by Ernest Cushing Richardson, in Nicene and Post-Nicene Fathers, Series II, Vol. I (eds. Philip Schaff and Henry Wace; Buffalo: Christian Literature Publishing Co., 1890). Public domain. Digital text via New Advent Church Fathers.