The pre-WWII Shanghai(international settlement) Municipal Police(specifically the Reserve Unit) with the direct support of folks like Fairbairn/Applegate and collaborative sharing with folks like Carlson/Edson might be worth looking into.
It's my understanding that pre-WWII Shanghai was a quite "interesting" environment in terms of illicit networks and some of the earliest SWAT like lessons were learned there.
I know there's a lot of content out there about the unarmed/armed CQB/CQC side of things as well as riot control experience gained from pre-WWII Shanghai.
I'm assuming there might be a little bit around early iterations of mechanical breaching due to the extremely dense urban terrain and broad/deep illicit networks operating there.
Certainly not the modern and refined interpretation of breaching as we know it today or recently, but might be of some limited historical/contextual value.
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