Kiwigrunt, I'm no fan of Storr's considerations about how few companies of a force are typically involved in combat at once. He exaggerates the point. That's especially ironic as he focuses much on the human side of war in that book.

Let's say a division has never more than ten companies at once in combat. Could it b replaced by a 10 company brigade? No!
There would be no rotation, the companies would quickly be exhausted if not depleted.
There would be no reserve, and thus no good tactics.
There would be no security elements, and thus great opportunities for OPFOR.
Perfect anticipation would be required to have these ten companies at the points of action.
OPFOR could deploy in a way which would require more than ten companies to counter.


It's one of the weaker parts of his book. My reasoning in favour of brigades rests on completely different foundations.