You make it sound like one replaced the other, corps/regimental brigades existed in harmony throughout NW's lifetime!
Things like the British Army (BA) used to do battles vs regimental brigades like mine the 83rd all the time.
Congrats though IVe, I always have time for you guys and Syrcrim is a good egg. Just wish there was brigades big enough to do 1v1's like we used to! IVe vs 2Lhr was always a good watch!