This is just to report an incident right at the start of a new RoP PBEM with the new patch.
I took that Austrian brigade that starts at Lobositz, sent the Grenzler bns back to Prag and moved the remnants (2 Hussar units) to Dippoldiswalde. I had two goals, to dispute loss of MC if the Prussians only put a screening force there (trying to make them attack Prina or wait for a normal starvation under siege rather than the event driven surrender), and related to this, to stop a lunge at Prag before all my corps had unlocked.
The outcome is the 2 unit Hussar brigade has completely blocked the Prussians from moving south, in part as their evade (5) is higher than the detect (4), so Fred's 2500 Pwr army (with 800 pwr cavalry) is actually blocked at Prina (at least till the camp falls and can't do anything to shift my Hussars).
This is a far beyond what I was looking for and seems to make Hussars (& I'd guess later Cossacks) almost the most powerful units in the game, able to block passage at no risk of being engaged? Not least I guess a similar trick would protect Koenigratz too.