Kristor at The Orthosphere has suggested several ways in which he believes that CS Lewis's novel That Hideous Strength provides relevant comparisons, inspiration and guidance for our current situation.
I very much like THS - but I don't think it has anything strategic to tell us about the current situation. In our world, unlike that of THS, the enemy has already won - and has been (very obviously) ruling the world since early 2020.
And there is plenty of active support for the Satanic rulers among the general population - especially (nearly unanimous) among the professional, technical and managerial classes. Almost everybody else is passively-compliant.
This comes on top of many decades of accelerating Christian apostasy, and the crushing blow against the Christian churches this year - so that they are barely operating, and have all but ceased their core functions. Judging by words and actions, and ignoring their assertions and claims; there are (here, now) extremely few Christians.
Many people I know of that I would have supposed to be serious Christians this time last year, I now realise are not, and were not. They may not realise it; but I realise now that they have joined the side of Satan: and are doing his work with great zeal and diligence.
But worst of all - it seems that hardly anybody has even noticed this greatest change in the world since 1939 - perhaps greater in scope and significance; and many of those who have noticed are (on the whole) fine with it, or believe that it will lead to good.
In such circumstances, calls to arms sound empty: Fight who? And how? And with which army?
And if we do fight, it is as 'resistance' in an already-defeated and fully-occupied nation; not as national defenders.
The best example I personally derive from THS is that 'the resistance' comprises half a dozen only-modestly-effective folk (the St Anne's group), whose 'power' is spiritual not temporal, and is personal rather than organisational - it comes mainly from their mutual support and encouragement (St Anne's is not even a community of beliefs or ideals).
If we have as much as this, we are fortunate. But it is enough: because this war is spiritual, not material; and its outcome is decided after this mortal life.
The fact is that we are in unprecedented territory and past comparisons are mostly misleading. It greatly adds to the difficulty that we must work-out what to do without help from tradition.
But that is our situation; and it first needs to be recognised and faced. And indeed that is half the battle.