From about 1920 through the 1940s, there was no organized or structured response to civil disturbance. At this time, a riot line consisted of 10- to 20-man lines of officers holding batons, axe handles, baseball bats, sticks, clubs, or anything they could put their hands on.
The mission of these riot lines was to forcefully disperse the crowd. So when the crowd came in contact with police, there was usually a free-for-all.
The riot lines of this era were poorly organized and had no structure. There was a person in charge, but often the chaotic nature of the event resulted in too many people in the area giving commands.
Each officer also used a different method of controlling the person(s) they had contact with, which sometimes resulted in them unknowingly taking away control another officer might have already established. In many agencies, we still have this problem.
During this era crowd control officers wore little-to-no protective gear. They didn't have soft body armor, so they hit the line with whatever protection they could create from seat cushions, newspapers, and any other makeshift armor that they could fashion. They did not wear the helmets we know today or face shields, no arm guards, and no groin guards. Imagine what it was like wading into an unruly mob under those conditions.